判断题Air France Flight 68 flew out at 7 p.m. when all the 350 passengers had boarded the plane as scheduled.A 对B 错
题目
判断题
Air France Flight 68 flew out at 7 p.m. when all the 350 passengers had boarded the plane as scheduled.
A
对
B
错
相似考题
更多“判断题Air France Flight 68 flew out at 7 p.m. when all the 350 passengers had boarded the plane as scheduled.A 对B 错”相关问题
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第1题：
The flight should take off at 10 p.m., but we()had to wait until twelve.
A、at last
B、as a result
C、in effect
D、on purpose
参考答案：C
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第2题：
共用题干
Please Fasten Your Seatbelts
Severe turbulence（湍流）can kill aircraft passengers. Now,in test flights over the Rocky
Mountains , NASA（美国航空航天局）engineers have successfully detected clear-air turbulence up to 10 seconds before an aircraft hits it.
Clear-air turbulence often catches pilots by surprise.Invisible to radar,it is difficult to forecast and can hurl（用力抛出去）passengers about the cabin. In December 1 997 , one passenger died and a hundred others were injured when unexpected rough air caused a United Airlines flight over the Pacific to drop 300 meters in a few seconds.
However,passengers can avoid serious injury by fastening their seatbelts.“It is the only antidote（对策）for this sort of thing,”says Rod Bogue,project manager at NASA's Dryden Flight
Research Center in Edwards,California.
The centre's new turbulence detector is based on lidar,or laser radar. Laser pulses are sent ahead of the plane and these are then reflected back by particles in the air. The technique depends on the Doppler effect.The wavelength of the light shifts according to the speed at which the particles are approaching. In calm air,the speed equals the plane's airspeed.But as the particles swirl（打漩）in rough air,their speed of approach increases or decreases rapidly .The rate of change in speed corresponds to the severity（激烈程度）of the turbulence.
In a series of tests that began last month,a research jet flew repeatedly into disturbed air over the mountain ridges（山脉）near Pueblo , Colorado. The lidar detector spotted turbulence between 3 and 8 kilometers ahead,and its forecasts of strength and duration corresponded closely with the turbulence that the plane encountered.
Bogue says that he had“a comfortable amount of time”to fasten his seatbelt. The researchers are planning to improve the lidar's range with a more powerful beam.The system could be installed on commercial aircraft in the next few years.We can infer from the fifth paragraph that______.
A: the lidar detector can successfully forecast turbulence
B: researchers are not sure about the effectiveness of the lidar detector
C: passenger planes will be used in further experiments
D: no more test flights are needed答案：A解析：本题问的是“clear-air turbulence”在文中指什么？turbulence的意思就是湍流，根据第二段第二句的说法，clear-air turbulence指的是雷达无法测到的一种turbulence，所以选项B为正确答案。
该题问的是1997年12月联合航空公司的一架班机在碰到这种气流后，遭遇了什么结果？原文讲到造成一人死亡，多人受伤，据此判断，损失惨重，故选C。
此题问气流探测器通过测量什么来判断它的激烈程度？第四段最后一句说“The rate of change in speed corresponds to the severity（激烈程度）of the turbulence.”所以选项 D为正确答案。
此题要求根据第五段的信息判断下面哪句话是正确的。显然，选项A符合原文的意思，为正确答案。
此题是根据最后一段的第二句“The researchers are planning to improve the lidar's range with a more powerful beam.”出的题，这句的意思是说，研究人员正计划采用功能更强大的光束来提高雷达的侧定范围。据此可以判断，雷达尚需改进，故A为正确答案。 -
第3题：
共用题干
Please Fasten Your Seatbelts
Severe turbulence（湍流）can kill aircraft passengers. Now,in test flights over the Rocky
Mountains , NASA（美国航空航天局）engineers have successfully detected clear-air turbulence up to 10 seconds before an aircraft hits it.
Clear-air turbulence often catches pilots by surprise.Invisible to radar,it is difficult to forecast and can hurl（用力抛出去）passengers about the cabin. In December 1 997 , one passenger died and a hundred others were injured when unexpected rough air caused a United Airlines flight over the Pacific to drop 300 meters in a few seconds.
However,passengers can avoid serious injury by fastening their seatbelts.“It is the only antidote（对策）for this sort of thing,”says Rod Bogue,project manager at NASA's Dryden Flight
Research Center in Edwards,California.
The centre's new turbulence detector is based on lidar,or laser radar. Laser pulses are sent ahead of the plane and these are then reflected back by particles in the air. The technique depends on the Doppler effect.The wavelength of the light shifts according to the speed at which the particles are approaching. In calm air,the speed equals the plane's airspeed.But as the particles swirl（打漩）in rough air,their speed of approach increases or decreases rapidly .The rate of change in speed corresponds to the severity（激烈程度）of the turbulence.
In a series of tests that began last month,a research jet flew repeatedly into disturbed air over the mountain ridges（山脉）near Pueblo , Colorado. The lidar detector spotted turbulence between 3 and 8 kilometers ahead,and its forecasts of strength and duration corresponded closely with the turbulence that the plane encountered.
Bogue says that he had“a comfortable amount of time”to fasten his seatbelt. The researchers are planning to improve the lidar's range with a more powerful beam.The system could be installed on commercial aircraft in the next few years.In December 1997,a United Airlines flight hit unexpected rough air,_______.
A: causing a lot of damage to the plane
B: throwing its passengers out of the cabin
C: resulting in heavy casualties
D: forcing the pilot to make an emergency landing答案：C解析：本题问的是“clear-air turbulence”在文中指什么？turbulence的意思就是湍流，根据第二段第二句的说法，clear-air turbulence指的是雷达无法测到的一种turbulence，所以选项B为正确答案。
该题问的是1997年12月联合航空公司的一架班机在碰到这种气流后，遭遇了什么结果？原文讲到造成一人死亡，多人受伤，据此判断，损失惨重，故选C。
此题问气流探测器通过测量什么来判断它的激烈程度？第四段最后一句说“The rate of change in speed corresponds to the severity（激烈程度）of the turbulence.”所以选项 D为正确答案。
此题要求根据第五段的信息判断下面哪句话是正确的。显然，选项A符合原文的意思，为正确答案。
此题是根据最后一段的第二句“The researchers are planning to improve the lidar's range with a more powerful beam.”出的题，这句的意思是说，研究人员正计划采用功能更强大的光束来提高雷达的侧定范围。据此可以判断，雷达尚需改进，故A为正确答案。 -
第4题：
All passengers should present their _____ documents at the check-in counter.A. boarded
B. boarding
C. to board
D. boards答案：B解析： -
第5题：
Hardly__when they ran toward it.A.had the plane landed
B.did the plane land
C.the plane had landed
D.the plane landed答案：A解析：表示否定意义的词hardly放在句首，句子倒装。hardly所在的句子中要用过去完成时态，与when引导的状语从句中的过去时配合。 -
第6题：
共用题干
Please Fasten Your Seatbelts
Severe turbulence（湍流）can kill aircraft passengers.Now,in test flights over the Rocky Mountains, NASA（美国航空航天局）engineers have successfully detected clear-air turbulence up to 10 seconds before an aircraft hits it.
Clear-air turbulence often catches pilots by surprise.Invisible to radar,it is difficult to forecast and can hurl（用力抛出去）passengers about the cabin.In December 1997 , one passenger died and a hundred others were injured when unexpected rough air caused a United Airlines flight over the Pacific to drop 300 meters in a few seconds.
However,passengers can avoid serious injury by fastening their seatbelts."It is the only antidote（对 策）for this sort of thing,"says Rod Bogue, project manager at NASA's Dryden Flight Research Center in Edwards,California.
The Center's new turbulence detector is based on lidar,or laser-radar.Laser pulses are sent ahead of the plane and these are then reflected back by particles in the air.The technique depends on the Doppler Effect（多普勒效应）.The wavelength of the light shifts according to the speed at which the particles are approaching.In calm air,the speed equals the plane's airspeed.But as the particles swirl（打漩） in rough air,their speed of approach increases or decreases rapidly.The rate of change in speed corresponds to the severity（激烈程度）of the turbulence.
In a series of tests that began last month,a research jet flew repeatedly into、 disturbed air over the mountain ridges（山脉）near Pueblo , Colorado.The lidar detector spotted turbulence between 3 and 8 kilometers ahead, and its forecasts of strength and duration corresponded closely with the turbulence that the plane encountered.
Bogue says that he had"a comfortable amount of time"to fasten his seatbelt.The researchers are planning to improve the lidar's range with a more powerful beam.The system could be installed on commercial aircraft in the next few years.What does"clear-air turbulence"in Paragraph 1 probably mean?
A:A not very rough storm.
B:Unexpected disturbed air.
C:A kind of visible storm.
D:A storm over mountain ridges.答案：B解析：根据第二段第三句，再结合上文可知，clear-air turbulence指的是第二段第三段中的“unexpectedrough air"，又由于disturbed与rough意义相近，故选B。
根据二段最后一句可知，1997年12月份的晴空湍流导致1人死亡、100人受伤，可以说是造成了很多伤亡。
根据第四段最后一句可知，晴空湍流的强度与微粒速度的变化有关。
根据第五段最后一句可知，激光雷达探测器能够探测到前方3千米到8千米之间的晴空湍流，并且预测的晴空湍流的强度和持续时间与真实情况相符。这说明激光雷达探测器能成功地预测晴空湍流。
根据最后一段第二句可知，研究人员正计划改善激光雷达探测器，准备使用更强的电脉冲来提升激光雷达探测器的探测范围。 -
第7题：
共用题干
Please Fasten Your Seatbelts
Severe turbulence（湍流）can kill aircraft passengers.Now,in test flights over the Rocky Mountains, NASA（美国航空航天局）engineers have successfully detected clear-air turbulence up to 10 seconds before an aircraft hits it.
Clear-air turbulence often catches pilots by surprise.Invisible to radar,it is difficult to forecast and can hurl（用力抛出去）passengers about the cabin.In December 1997 , one passenger died and a hundred others were injured when unexpected rough air caused a United Airlines flight over the Pacific to drop 300 meters in a few seconds.
However,passengers can avoid serious injury by fastening their seatbelts."It is the only antidote（对 策）for this sort of thing,"says Rod Bogue, project manager at NASA's Dryden Flight Research Center in Edwards,California.
The Center's new turbulence detector is based on lidar,or laser-radar.Laser pulses are sent ahead of the plane and these are then reflected back by particles in the air.The technique depends on the Doppler Effect（多普勒效应）.The wavelength of the light shifts according to the speed at which the particles are approaching.In calm air,the speed equals the plane's airspeed.But as the particles swirl（打漩） in rough air,their speed of approach increases or decreases rapidly.The rate of change in speed corresponds to the severity（激烈程度）of the turbulence.
In a series of tests that began last month,a research jet flew repeatedly into、 disturbed air over the mountain ridges（山脉）near Pueblo , Colorado.The lidar detector spotted turbulence between 3 and 8 kilometers ahead, and its forecasts of strength and duration corresponded closely with the turbulence that the plane encountered.
Bogue says that he had"a comfortable amount of time"to fasten his seatbelt.The researchers are planning to improve the lidar's range with a more powerful beam.The system could be installed on commercial aircraft in the next few years.We can infer from the fifth paragraph that____＿.
A:the lidar detector can successfully forecast turbulence
B:researchers are not sure about the effectiveness of the lidar detector
C:passenger planes will be used in further experiments
D:no more test flights are needed答案：A解析：根据第二段第三句，再结合上文可知，clear-air turbulence指的是第二段第三段中的“unexpectedrough air"，又由于disturbed与rough意义相近，故选B。
根据二段最后一句可知，1997年12月份的晴空湍流导致1人死亡、100人受伤，可以说是造成了很多伤亡。
根据第四段最后一句可知，晴空湍流的强度与微粒速度的变化有关。
根据第五段最后一句可知，激光雷达探测器能够探测到前方3千米到8千米之间的晴空湍流，并且预测的晴空湍流的强度和持续时间与真实情况相符。这说明激光雷达探测器能成功地预测晴空湍流。
根据最后一段第二句可知，研究人员正计划改善激光雷达探测器，准备使用更强的电脉冲来提升激光雷达探测器的探测范围。 -
第8题：
Let me tell you a story about Bert and Mildred Bumbridge,who used to be very forgetful.For?example,Mildred would forget to cook dinner,or Bert would show up for work on Sunday thinking it?was Monday.One summer,they were to take a long plane trip.What do you suppose happened?
Well,they got to the airport with only ten minutes to spare.In that situation,anyone would board the?plane right away.But not Mr.and Mrs.Bumbridge.They just had to buy some flight insurance first.
After all,who knows what will happen on a plane flight??They quickly put some coins into a machine?and out came their insurance policy."Who would get the money if we crash,I wonder??"asked?Mildred."My mother,of course,"her husband replied."We′ll mnil the policy to her.Now quick,give me a stamp,will you.9"he said."The plane is going to take off in another minute."Bert put the?stamp on the envelope,dropped it in the mail box,and suddenly let out a cry.What happened,do?you suppose??He had mailed their plane tickets to his mother!
What was the reason why Mr.Bumbridge made such a foolish mistake at the airport??A.He had to do everything in a great rush.
B.It was his first flight,and he was very worried about it.
C.He had forgotten to bring a stamp for his mother's letter.
D.He was very worried about his mother.答案：A解析：从文中第十四、十五句可知他们必须在最短的时间内做完这些事，所以会出错。欲速则不达，唯有A项正确。
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第9题：
Let me tell you a story about Bert and Mildred Bumbridge,who used to be very forgetful.For?example,Mildred would forget to cook dinner,or Bert would show up for work on Sunday thinking it?was Monday.One summer,they were to take a long plane trip.What do you suppose happened?
Well,they got to the airport with only ten minutes to spare.In that situation,anyone would board the?plane right away.But not Mr.and Mrs.Bumbridge.They just had to buy some flight insurance first.
After all,who knows what will happen on a plane flight??They quickly put some coins into a machine?and out came their insurance policy."Who would get the money if we crash,I wonder??"asked?Mildred."My mother,of course,"her husband replied."We′ll mnil the policy to her.Now quick,give me a stamp,will you.9"he said."The plane is going to take off in another minute."Bert put the?stamp on the envelope,dropped it in the mail box,and suddenly let out a cry.What happened,do?you suppose??He had mailed their plane tickets to his mother!
What did Bert want to mail to his mother??A.An empty envelope.
B.Sotne coins.
C.The tickets.
D.The insurance policy.答案：D解析：从文章第十二、十三句可知他要把保险单寄给妈妈，选D项。 -
第10题：
单选题As the plane flew off towards the mountains in the distance the sound of its engines gradually ______.Adied away
Bsank down
Cdropped off
Dwent out
正确答案： A解析：
随着飞机飞向远处的山脉，引擎的声音逐渐消失。die away渐息，渐弱。sink down沉落。drop off离开，散去；逐渐减少。go out出去；熄灭；过时。 -
第11题：
单选题When they had finished playing, the children were made to _____ all the toys they had taken out.Aput out
Bput off
Cput up
Dput away
正确答案： C解析： -
第12题：
填空题Before the flight takes off, all passengers are asked to (fast) ____ their seat belts.正确答案： fasten解析：
本题考查词性转换。句意：在飞机没起飞前，所以的乘客都被要求系好安全带。由ask sb. to do sth.可知，to后接不定式动词原形，即需要把形容词fast转换为动词fasten，意为“把……拴紧”。 -
第13题：
Hardly ______when they ran toward it.
A. had the plane landed
B. did the plane land
C. the plane had landed
D. the plane landed
正确答案：A
【参考分析】表示否定意义的词hardly放在句首，句子倒装。hardly所在的句子中要用过去完成时态，与when引导的状语从句中的过去时配合。 -
第14题：
共用题干
Please Fasten Your Seatbelts
Severe turbulence（湍流）can kill aircraft passengers. Now,in test flights over the Rocky
Mountains , NASA（美国航空航天局）engineers have successfully detected clear-air turbulence up to 10 seconds before an aircraft hits it.
Clear-air turbulence often catches pilots by surprise.Invisible to radar,it is difficult to forecast and can hurl（用力抛出去）passengers about the cabin. In December 1 997 , one passenger died and a hundred others were injured when unexpected rough air caused a United Airlines flight over the Pacific to drop 300 meters in a few seconds.
However,passengers can avoid serious injury by fastening their seatbelts.“It is the only antidote（对策）for this sort of thing,”says Rod Bogue,project manager at NASA's Dryden Flight
Research Center in Edwards,California.
The centre's new turbulence detector is based on lidar,or laser radar. Laser pulses are sent ahead of the plane and these are then reflected back by particles in the air. The technique depends on the Doppler effect.The wavelength of the light shifts according to the speed at which the particles are approaching. In calm air,the speed equals the plane's airspeed.But as the particles swirl（打漩）in rough air,their speed of approach increases or decreases rapidly .The rate of change in speed corresponds to the severity（激烈程度）of the turbulence.
In a series of tests that began last month,a research jet flew repeatedly into disturbed air over the mountain ridges（山脉）near Pueblo , Colorado. The lidar detector spotted turbulence between 3 and 8 kilometers ahead,and its forecasts of strength and duration corresponded closely with the turbulence that the plane encountered.
Bogue says that he had“a comfortable amount of time”to fasten his seatbelt. The researchers are planning to improve the lidar's range with a more powerful beam.The system could be installed on commercial aircraft in the next few years.What does“clear-air turbulence”in Paragraph 1 probably mean?
A: A not very rough storm.
B: Unexpected disturbed air.
C: A kind of visible storm.
D: A storm over mountain ridges.答案：B解析：本题问的是“clear-air turbulence”在文中指什么？turbulence的意思就是湍流，根据第二段第二句的说法，clear-air turbulence指的是雷达无法测到的一种turbulence，所以选项B为正确答案。
该题问的是1997年12月联合航空公司的一架班机在碰到这种气流后，遭遇了什么结果？原文讲到造成一人死亡，多人受伤，据此判断，损失惨重，故选C。
此题问气流探测器通过测量什么来判断它的激烈程度？第四段最后一句说“The rate of change in speed corresponds to the severity（激烈程度）of the turbulence.”所以选项 D为正确答案。
此题要求根据第五段的信息判断下面哪句话是正确的。显然，选项A符合原文的意思，为正确答案。
此题是根据最后一段的第二句“The researchers are planning to improve the lidar's range with a more powerful beam.”出的题，这句的意思是说，研究人员正计划采用功能更强大的光束来提高雷达的侧定范围。据此可以判断，雷达尚需改进，故A为正确答案。 -
第15题：
共用题干
Please Fasten Your Seatbelts
Severe turbulence（湍流）can kill aircraft passengers. Now,in test flights over the Rocky
Mountains , NASA（美国航空航天局）engineers have successfully detected clear-air turbulence up to 10 seconds before an aircraft hits it.
Clear-air turbulence often catches pilots by surprise.Invisible to radar,it is difficult to forecast and can hurl（用力抛出去）passengers about the cabin. In December 1 997 , one passenger died and a hundred others were injured when unexpected rough air caused a United Airlines flight over the Pacific to drop 300 meters in a few seconds.
However,passengers can avoid serious injury by fastening their seatbelts.“It is the only antidote（对策）for this sort of thing,”says Rod Bogue,project manager at NASA's Dryden Flight
Research Center in Edwards,California.
The centre's new turbulence detector is based on lidar,or laser radar. Laser pulses are sent ahead of the plane and these are then reflected back by particles in the air. The technique depends on the Doppler effect.The wavelength of the light shifts according to the speed at which the particles are approaching. In calm air,the speed equals the plane's airspeed.But as the particles swirl（打漩）in rough air,their speed of approach increases or decreases rapidly .The rate of change in speed corresponds to the severity（激烈程度）of the turbulence.
In a series of tests that began last month,a research jet flew repeatedly into disturbed air over the mountain ridges（山脉）near Pueblo , Colorado. The lidar detector spotted turbulence between 3 and 8 kilometers ahead,and its forecasts of strength and duration corresponded closely with the turbulence that the plane encountered.
Bogue says that he had“a comfortable amount of time”to fasten his seatbelt. The researchers are planning to improve the lidar's range with a more powerful beam.The system could be installed on commercial aircraft in the next few years.The last paragraph tells us,among other things,that_______.
A: the lidar detector needs improvement
B: many airlines are interested in the system
C: passengers often forget to fasten their seatbelts
D: the lidar detector can be used in a wide range of areas答案：A解析：本题问的是“clear-air turbulence”在文中指什么？turbulence的意思就是湍流，根据第二段第二句的说法，clear-air turbulence指的是雷达无法测到的一种turbulence，所以选项B为正确答案。
该题问的是1997年12月联合航空公司的一架班机在碰到这种气流后，遭遇了什么结果？原文讲到造成一人死亡，多人受伤，据此判断，损失惨重，故选C。
此题问气流探测器通过测量什么来判断它的激烈程度？第四段最后一句说“The rate of change in speed corresponds to the severity（激烈程度）of the turbulence.”所以选项 D为正确答案。
此题要求根据第五段的信息判断下面哪句话是正确的。显然，选项A符合原文的意思，为正确答案。
此题是根据最后一段的第二句“The researchers are planning to improve the lidar's range with a more powerful beam.”出的题，这句的意思是说，研究人员正计划采用功能更强大的光束来提高雷达的侧定范围。据此可以判断，雷达尚需改进，故A为正确答案。 -
第16题：
It was Ann′s first experience of flying..She had always been afraid of heights and so was prepared?to be frightened.Only the fact that she was going to meet her son who she had not seen for?three years had given her the courage to make the flight.
She sat in her seat,her hands gripping its arms,her seat belt already fastened.The air hostess?was talking,telling everyone what to do in case of emergency,showing them where their life-jackets?were.The plane was crowded,and every seat was full.From her window seat,getting out in a hurry?would be impossible,thought Ann.In any case who would want to get out of a plane in mid-air?
The engines began to shake--the noise increased till it was like a great rushing wind.She?looked out to see the runway slip past at astonishing speed.She wanted to cry out--to stop the plane?before it left the ground,but she knew she was trapped in this great roaring machine.I must scream,she told herself,and put her hands over her eyes.
There was a strange feeling as if she were going up in a lift.The noise died down.Carefully she?opened her eyes.Through the window she saw a great carpet of cloud above,so beautiful that she?stared in wonder,hardly turning away from the window till they touched down.
Why did Ann want to scream?《》（）A.Because the plane didn't leave the ground.
B.Because she couldn't make the plane stop.
C.Because she couldn't hear the wind.
D.Because she couldn't see the runway.答案：B解析：【考情点拨】事实细节题。【应试指导】文章第三段第三、四句指出，在飞机起飞前安想叫喊出来让它停下来．但她又不能让飞机停下来，所以她想scream。 -
第17题：
共用题干
Please Fasten Your Seatbelts
Severe turbulence（湍流）can kill aircraft passengers.Now,in test flights over the Rocky Mountains, NASA（美国航空航天局）engineers have successfully detected clear-air turbulence up to 10 seconds before an aircraft hits it.
Clear-air turbulence often catches pilots by surprise.Invisible to radar,it is difficult to forecast and can hurl（用力抛出去）passengers about the cabin.In December 1997 , one passenger died and a hundred others were injured when unexpected rough air caused a United Airlines flight over the Pacific to drop 300 meters in a few seconds.
However,passengers can avoid serious injury by fastening their seatbelts."It is the only antidote（对 策）for this sort of thing,"says Rod Bogue, project manager at NASA's Dryden Flight Research Center in Edwards,California.
The Center's new turbulence detector is based on lidar,or laser-radar.Laser pulses are sent ahead of the plane and these are then reflected back by particles in the air.The technique depends on the Doppler Effect（多普勒效应）.The wavelength of the light shifts according to the speed at which the particles are approaching.In calm air,the speed equals the plane's airspeed.But as the particles swirl（打漩） in rough air,their speed of approach increases or decreases rapidly.The rate of change in speed corresponds to the severity（激烈程度）of the turbulence.
In a series of tests that began last month,a research jet flew repeatedly into、 disturbed air over the mountain ridges（山脉）near Pueblo , Colorado.The lidar detector spotted turbulence between 3 and 8 kilometers ahead, and its forecasts of strength and duration corresponded closely with the turbulence that the plane encountered.
Bogue says that he had"a comfortable amount of time"to fasten his seatbelt.The researchers are planning to improve the lidar's range with a more powerful beam.The system could be installed on commercial aircraft in the next few years.The last paragraph tells us,among other things,that____＿.
A:the lidar detector needs improvement
B:many airlines are interested in the system
C:passengers often forget to fasten their seatbelts
D:the lidar detector can be used in a wide range of areas答案：A解析：根据第二段第三句，再结合上文可知，clear-air turbulence指的是第二段第三段中的“unexpectedrough air"，又由于disturbed与rough意义相近，故选B。
根据二段最后一句可知，1997年12月份的晴空湍流导致1人死亡、100人受伤，可以说是造成了很多伤亡。
根据第四段最后一句可知，晴空湍流的强度与微粒速度的变化有关。
根据第五段最后一句可知，激光雷达探测器能够探测到前方3千米到8千米之间的晴空湍流，并且预测的晴空湍流的强度和持续时间与真实情况相符。这说明激光雷达探测器能成功地预测晴空湍流。
根据最后一段第二句可知，研究人员正计划改善激光雷达探测器，准备使用更强的电脉冲来提升激光雷达探测器的探测范围。 -
第18题：
共用题干
Please Fasten Your Seatbelts
Severe turbulence（湍流）can kill aircraft passengers.Now,in test flights over the Rocky Mountains, NASA（美国航空航天局）engineers have successfully detected clear-air turbulence up to 10 seconds before an aircraft hits it.
Clear-air turbulence often catches pilots by surprise.Invisible to radar,it is difficult to forecast and can hurl（用力抛出去）passengers about the cabin.In December 1997 , one passenger died and a hundred others were injured when unexpected rough air caused a United Airlines flight over the Pacific to drop 300 meters in a few seconds.
However,passengers can avoid serious injury by fastening their seatbelts."It is the only antidote（对 策）for this sort of thing,"says Rod Bogue, project manager at NASA's Dryden Flight Research Center in Edwards,California.
The Center's new turbulence detector is based on lidar,or laser-radar.Laser pulses are sent ahead of the plane and these are then reflected back by particles in the air.The technique depends on the Doppler Effect（多普勒效应）.The wavelength of the light shifts according to the speed at which the particles are approaching.In calm air,the speed equals the plane's airspeed.But as the particles swirl（打漩） in rough air,their speed of approach increases or decreases rapidly.The rate of change in speed corresponds to the severity（激烈程度）of the turbulence.
In a series of tests that began last month,a research jet flew repeatedly into、 disturbed air over the mountain ridges（山脉）near Pueblo , Colorado.The lidar detector spotted turbulence between 3 and 8 kilometers ahead, and its forecasts of strength and duration corresponded closely with the turbulence that the plane encountered.
Bogue says that he had"a comfortable amount of time"to fasten his seatbelt.The researchers are planning to improve the lidar's range with a more powerful beam.The system could be installed on commercial aircraft in the next few years.In December 1997,a United Airlines flight hit unexpected rough air______.
A:causing a lot of damage to the plane
B:throwing its passengers out of the cabin
C:resulting in heavy casualties
D:forcing the pilot to make an emergency landing答案：C解析：根据第二段第三句，再结合上文可知，clear-air turbulence指的是第二段第三段中的“unexpectedrough air"，又由于disturbed与rough意义相近，故选B。
根据二段最后一句可知，1997年12月份的晴空湍流导致1人死亡、100人受伤，可以说是造成了很多伤亡。
根据第四段最后一句可知，晴空湍流的强度与微粒速度的变化有关。
根据第五段最后一句可知，激光雷达探测器能够探测到前方3千米到8千米之间的晴空湍流，并且预测的晴空湍流的强度和持续时间与真实情况相符。这说明激光雷达探测器能成功地预测晴空湍流。
根据最后一段第二句可知，研究人员正计划改善激光雷达探测器，准备使用更强的电脉冲来提升激光雷达探测器的探测范围。 -
第19题：
共用题干
Please Fasten Your Seatbelts
Severe turbulence（湍流）can kill aircraft passengers.Now,in test flights over the Rocky Mountains, NASA（美国航空航天局）engineers have successfully detected clear-air turbulence up to 10 seconds before an aircraft hits it.
Clear-air turbulence often catches pilots by surprise.Invisible to radar,it is difficult to forecast and can hurl（用力抛出去）passengers about the cabin.In December 1997 , one passenger died and a hundred others were injured when unexpected rough air caused a United Airlines flight over the Pacific to drop 300 meters in a few seconds.
However,passengers can avoid serious injury by fastening their seatbelts."It is the only antidote（对 策）for this sort of thing,"says Rod Bogue, project manager at NASA's Dryden Flight Research Center in Edwards,California.
The Center's new turbulence detector is based on lidar,or laser-radar.Laser pulses are sent ahead of the plane and these are then reflected back by particles in the air.The technique depends on the Doppler Effect（多普勒效应）.The wavelength of the light shifts according to the speed at which the particles are approaching.In calm air,the speed equals the plane's airspeed.But as the particles swirl（打漩） in rough air,their speed of approach increases or decreases rapidly.The rate of change in speed corresponds to the severity（激烈程度）of the turbulence.
In a series of tests that began last month,a research jet flew repeatedly into、 disturbed air over the mountain ridges（山脉）near Pueblo , Colorado.The lidar detector spotted turbulence between 3 and 8 kilometers ahead, and its forecasts of strength and duration corresponded closely with the turbulence that the plane encountered.
Bogue says that he had"a comfortable amount of time"to fasten his seatbelt.The researchers are planning to improve the lidar's range with a more powerful beam.The system could be installed on commercial aircraft in the next few years.The turbulence detector can tell the severity of the turbulence by measuring______.
A:the speed of the plane
B:the speed of the light
C:the number of particles in the air
D:the changes of the particles'speed答案：D解析：根据第二段第三句，再结合上文可知，clear-air turbulence指的是第二段第三段中的“unexpectedrough air"，又由于disturbed与rough意义相近，故选B。
根据二段最后一句可知，1997年12月份的晴空湍流导致1人死亡、100人受伤，可以说是造成了很多伤亡。
根据第四段最后一句可知，晴空湍流的强度与微粒速度的变化有关。
根据第五段最后一句可知，激光雷达探测器能够探测到前方3千米到8千米之间的晴空湍流，并且预测的晴空湍流的强度和持续时间与真实情况相符。这说明激光雷达探测器能成功地预测晴空湍流。
根据最后一段第二句可知，研究人员正计划改善激光雷达探测器，准备使用更强的电脉冲来提升激光雷达探测器的探测范围。 -
第20题：
Let me tell you a story about Bert and Mildred Bumbridge,who used to be very forgetful.For?example,Mildred would forget to cook dinner,or Bert would show up for work on Sunday thinking it?was Monday.One summer,they were to take a long plane trip.What do you suppose happened?
Well,they got to the airport with only ten minutes to spare.In that situation,anyone would board the?plane right away.But not Mr.and Mrs.Bumbridge.They just had to buy some flight insurance first.
After all,who knows what will happen on a plane flight??They quickly put some coins into a machine?and out came their insurance policy."Who would get the money if we crash,I wonder??"asked?Mildred."My mother,of course,"her husband replied."We′ll mnil the policy to her.Now quick,give me a stamp,will you.9"he said."The plane is going to take off in another minute."Bert put the?stamp on the envelope,dropped it in the mail box,and suddenly let out a cry.What happened,do?you suppose??He had mailed their plane tickets to his mother!
What did Bert and Mildred get after putting coins into the machine??A.A stamp.
B.An envelope.
C.Two tickets.
D.Some flight insurance.答案：D解析：本题问Bert和Mildred向机器里投币之后拿到了什么，由文章第十句“The）,quickly put sortie coins in-to a machine and uut came their insurance policy．”可知D项正确。 -
第21题：
The bus broke down and all the passengers had to（）
Aget in
Bget on
Cget off
C
略 -
第22题：
单选题Passengers should send their application to Air France ______.Aupon receiving the application form
Bwithin 3 weeks of their first flight
Cbefore their first flight with Air France
Dwithin 6 months of joining the program
正确答案： B解析：
考点:推理判断题。文章第三标题的b)中提到，申请书必须在首次飞行后三周以内送达航空公司，B项正确。A项“一收到申请表”，C项“ 在首次飞行之前”和D项“加入项目6个月以内”都不是正确时间。 -
第23题：
单选题Air France carries out its Frequency Plus _____.Athrough its reduced ticket prices
Bthrough its extensive network of partners
Cby providing convenient flight schedules
Dby offering excellent services on board
正确答案： A解析：
根据文章的首句话可以找到关键信息“Air France offers you Frequency Plus through an extensive network of our partners”，法航通过广泛的合作商网络实施的常旅客里程奖励计划，选项B是原文的直接引述，是正确答案。A项断章取义，文中提到了奖励计划，但是这不是为了降低票价，与题目要求无关。C项和D项均属于无中生有，文中都没有涉及这两个选项。