单选题These plants are rather difficult（）A to look afterB to be looked afterC being looked afterD looking after
题目
to look after
to be looked after
being looked after
looking after
相似考题
更多“These plants are rather difficult（）”相关问题
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第1题：
What is the 'biggest city in the world? That is, (21) city has the largest population? This seems like (22) question to answer, but actually it isn't.
It's actually rather difficult to say which cities (23) the largest. There are two reasons for this difficulty. First of all, it isn't easy to determine a city's boundaries, that is, where a city ends. Nowadays, nearly all cities have a large (24) area around them. So when we talk about the population of a city, we often mean the population of the whole metropolitan area around the city. That means that it's difficult to determine what the population of a city is because it's difficult to define what a city is.
The second reason that it is difficult to 25 the population of different cities is this: it is almost impossible to get (26) about the population of all cities for the same year. For example, we might get an estimate of New York's population in 1979 and an (27) of Mexico City's population in 1981. So we real ly can't compare the numbers because the information is for (28) different years. And the population of cities changes rather quickly, especially in some cases. For example, the population of Jakarta, Indonesia, may increase by 5% each year, so the population figure will change rather quickly.
So we can say that these are our two (29) for comparing the populations of cities: one, it's difficult to determine the (30) of a city, and two, it is difficult to get accurate information.
21. A. what
B. which
C. where
D. how
正确答案：B首先判断此处缺少的是一个定语。参考上文及该句中that is这一短语可知，此处应填which一词。
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第2题：
It was ______ that he couldn't finish it alone.
A、a so difficult work
B、a so difficult job
C、such a difficult job
D、such a difficult work
参考答案：C
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第3题：
共用题干
第一篇
Putting Plants to Work
Using the power of the sun is nothing new.People have had solar-powered calculators and buildings with
solar panels（太阳能电池板）for decades. But plants are the real experts. They' ve been using sunlight as an
energy source for billions of years.
Cells in the green leaves of plants work like tiny factories to convert sunlight, carbon dioxide（二氧化
碳）,and water into sugars
and starche（淀粉）,stored energy that the piants can use. This conversion
process is called photosynthesis (光合作用）Unfortunately, unless you' re a plant, it's difficult and
expensive to convert sunlight into storable energy. That's why scientists are taking a closer look at exactly
how plants do it.
Some scientists are trying to get plants,or biological cells that act like plants, to work as very small
photosynthesic power stations. For example, Maria Ghirardi of the National Renewable Energy Laboratory in
Golden. Cobo.,is working with green algae（水藻）.She's trying to trick them into producing hydrogen
instead of sugars when they perform photosynthesis. Once the researchers can get the algae working efficient-
ly ,the hydrogen that they produce could be used to power fuel cells in cars or to generate electricity.
The algae are grown in narrow-necked glass bottles to produce hydrogen in the lab. During photosynthe-
sis , plants normally make sugars or strchds. "But under certain conditions,a lot of algae are able to use the
sunlight energy not to store starch , but to make hydrogen."Ghirardi says. For example ,algae will produce hy-
drogen in an airfree environment. It' s the oxygen in the air that prevents algae from making hydrogen most of
the time.
Working in an airfree environment, however, is difficult. It's not a practical way to produce cheap
energy. But Ghirardi and her colleagues have discovered that by removing a chemical called sulfate（硫酸盐）
from the environment that the algae grow in, they will make hydrogen instead of sugars,even when air
is present.
Unfortunately, removing the sulfate also makes the algae's cells work very slowly,and not much
hydrogen is produced. Still ,the researchers see this as a first step in their goal to produce hydrogen efficiently
from algae. With more work,they may be able to speed the cells' activity and produce larger quantities
of hydrogen.
The researchers hope that algae will one day be an easy-to-use fuel source. The organisms are cheap to
get and to feed, Ghirardi says,and they can grow almost anywhere:"You can grow them in a reactor, in a
pond. You can grow them in the ocean. There's a lot of flexibility in how you can use these organisms."Researchers find it difficult to make algae produce hydrogen efficiently because_______________.
A:it is hard to create an airfree environment
B:it is expensive to remove the sulfate from the environment
C:removing the sulfate slows down hydrogen production
D:the algae's cells work slowly if there is no oxygen in the air答案：C解析：由第一段第三、四句话“But plants are the real experts.They' ye been using sunlight as an energy source for billions of years.”可知答案。
文章的第三段说，科学家企图将植物或植物类生物细胞作为微型光合作用能源供应站 来研究，并举例说，他们正在用绿藻进行实验，若成功，绿藻所产生的氢气将可用来为汽车的燃 料电池充电。所以答案是D。
由文章第四段最后两句“…algae will produce hydrogen in an airfree environment.It' s the oxygen in the air that prevents algae from making hydrogen most of the time.（……绿藻在没有空气 的环境下能产生氢气，是空气中的氧气在阻止绿藻制造氢气。）”可知选B。
A、B都不是正确答案，因为短文的第五段、第六段告诉我们，remove the sulfate和work in an airfree environment都是可能的，但问题是两者都有弊端，使氢气的制造不那么容易。C所 述内容就是困难之一：绿藻细胞因为没有了sulfate而减缓工作速度，因此产生不了多少氢气。 D项与第四段末尾所说的“是空气中的氧气在阻止绿藻制造氢气”矛盾。故选C。
根据最后一段Ghirardi所说的话可知，绿藻可以在任何地方生长，而且用途广泛，联系 此段首句可知Ghirardi所说的意在表示绿藻易于广泛应用，有望成为一种好的能源。故选A。 B项未提到，C项“它们将被到处种植”也不是Ghirardi的话的真正意思，他只是说绿藻易于广 泛种植。D项是对文中“feed”一词所在句的错误理解，feed在此意为“养”。第二篇 文章主要讲的是公共土地在美国能源生产方面的重大作用，分别从产量、税收、未开发的传 统能源、替代能源占全国的份额以及能源开发需求等方面进行了介绍。 -
第4题：
共用题干
Plants in Desert
Only special plants can survive the terrible climate of a desert,for these are regions where the annual range of the soil temperature can be over 75℃．Furthermore,during the summer there are few clouds in the sky to protect plants from the sun's ray.Another problem is the fact that there are frequently strong winds that drive small,sharp particles of sand into the plants,tearing and damaging them.The most difficult problem for all forms of plant life,however,is the fact that the entire annual rainfall occurs during a few days or weeks in spring.
Grasses and flowers in desert survive from one year to the next by existing through the long,hot,dry season in the form of seeds.These seeds remain inactive unless the right amount of rain falls.If no rain falls,or if insufficient rain falls,they wait until the next year,or even still the next.Another factor that helps these plants to survive is the fact that their life cycles are short.By the time the water from the spring rains disappears-just a few weeks after it falls-such plants no longer need any.
The perennials（多年生植物）have special features that enable them to survive as plants for several years.Thus,nearly all desert perennials have extensive root systems below ground and a small shoot system above ground.The large root network enables the plant to absorb as much water as possible in short time.
The small shoot system,on the other hand,considerably limits water loss by evaporation（蒸发）.
Another feature of many perennials is that after the rainy season they lose their leaves in preparation for the long,dry season,just as trees in wetter climates lose theirs in preparation for the winter.This reduces their water loss by evaporation during the dry season.Then,in next rainy season,they come fully alive once more,and grow new branches,leaves and flowers,just as the grasses and flowers in desert do.
A:Right
B:Wrong
C:Not mentioned答案：A解析：根据第一段第一句可知，只有特殊的植物才能在沙漠中存活，这是因为沙漠中土壤的温度过高，每年的温度能达到75℃以上，而并不是因为沙漠中的气候变化多端。
根据线索词“Grasses and flowers”和“see1seeas"，可以很快把第二段第一句确定为答案相关句。这个句子的大意是：沙漠里的花草年复一年以种子的形式度过漫长、炎热，而又干燥的季节。可见题干的说法与原文的说法一致，所以选择A项。
题干的大意是：沙漠里春季的雨水很快会消失，而沙漠里生命周期短的花草能够适应这一环境特点。利用题干中的“life cycles”作为线索词，可以很快把第二段第四、五句确定为答案相关句，这两句话表明，生命周期短能帮助植物在沙漠中存活，因为春季的雨水消失后，这些植物将不再需要雨水。可见题干的说法与原文的说法一致。
本篇文章并未提到冬天里花草最难生存，所以选择C项。
利用题干中的“The shoot system”作为线索词，可以把第三段最后一句确定为答案相关句。这句话表明，茎轴系统极大地限制了蒸发所带来的水分损失，而不是说茎轴系统能减少植物对太阳光线的吸收。可见题干与原文的说法不符。
倒数第二段的主题句是第一句，讲述的主要是沙漠多年生植物能生存的原因。题干表述正确，所以选择A项。
根据题干中的线索词“lose their leaves1 "，不难把最后一段第一、二句确定为答案相关句。这两句话表明，沙漠多年生植物和较湿润地区的树木落叶的原因是一样的，都是为了减少水分的蒸发。 -
第5题：
My friend told me that ( ).
A. the English language is difficult B. English is difficult
C. the English is difficult D. what English is difficult答案：B解析： -
第6题：
These plants are rather difficult（）
Ato look after
Bto be looked after
Cbeing looked after
Dlooking after
A
略 -
第7题：
These plants are rather difficult（）
- A、to look after
- B、to be looked after
- C、being looked after
- D、looking after
正确答案:A -
第8题：
单选题_____ to get a definition for this word!AHow it is difficult
Bhow difficult is it
CHow difficult it is
DIt is how difficult
正确答案： B解析：
句意：给这个词下个定义真难啊! how引导的感叹句，要用部分倒装结构，即：how＋形容词＋it is。 -
第9题：
单选题The author suggests which of the following about the fertilizer industry (lines 50－51)?AIts chemicals are ultimately ineffective in eradicating garden slugs.
BIt should focus on harnessing nature rather than 'creating artificial solutions.
CIt should go out of business if gardeners stopped depleting natural resources.
DIt sells some products of nature.
EIt discourages slugs from eating garden plants.
正确答案： B解析：
文中作者提到，化肥业销售大量泥土，是一个十分兴旺的行业，故选D项。 -
第10题：
多选题Consider each of the choices separately and select all that apply. Which of these can be inferred from the fact that the French built orangeries for certain tropical plants?AGreenhouses may be used to keep plants at a moderate temperature
BThe climate of France is unsuited to growing tropical plants outdoors.
CLouis ⅩⅣ was a frequent and enthusiastic traveler to Africa and Asia
正确答案： C,A解析：
有原文可知，法国人修建“orangeries”（温室）是为了保护热带植物，所以A和B选项都是合理的推测，但这没有暗示Louis X IV亲自寻找过异域的水果，C选项排除。 -
第11题：
单选题AThey are rather difficult to please.
BThey are rude to women drivers.
CThey are talkative and generous with tips.
DThey are different in personality.
正确答案： A解析：
谈到当司机遇到的人时，女士提到，司机工作的最大优势是能够遇见形形色色的人。D项“different in personality”是原文中various characters的同义转述。故D项为答案。
【录音原文】
M: Hello. Juliet. I know you are one of the few women taxi drivers in the city now, and you drive for a living. What made you want to become a taxi driver in the first place?
W: I took pride in driving well even when I was young, for I had to wait until I had a car to learn to drive. When I finally learned, it was something I really enjoyed and still enjoy. I remembered how smart those taxi drivers had seemed driving so well, and dressed so neatly in their uniforms and I thought I’d like to do that myself.
M: You really enjoy driving, I see. And how long have you been a taxi driver?
W: Er, all together 12 years.
M: Mm, for quite some time already, hasn’t it?
W: Yeah.
M: Then, what did you find the most difficult about becoming a taxi driver?
W: I can still remember when I was first learning to drive—it was scary, didn’t know yet how to judge distance, and when a big truck came near it seemed like its wheels would just come right over me. Anyway, soon I learned to judge distance. I began looking ahead, stopped worrying about trucks and about what was moving on either side.
M: In your opinion, what does it take to become a good driver?
W: Eh, besides driving well, the most important thing a taxi driver needs to know is the streets, and I knew the city well because I had lived in it for a long time. I knew all the main streets, and even the side streets. And of course you have to keep updating your knowledge of the streets, because the city changes. There might be a new road appearing somewhere one day.
M: Now, what about annual leaves? Do you have them?
W: Oh, yes. When I first started, I had only ten days. Now, I have three weeks every year, with pay.
M: Just out of curiosity. When you go on vacation to another place or city, do you drive there as well?
W: In most cases, not. I prefer to be driven by others, if we go by car. I would also prefer to go by train or plane, if there is a choice. I have already had too much driving in my life. So, when on holiday, I just want to relax.
M: I see. Let’s come back to your work. Are there any unpleasant aspects in your job?
W: The only serious difficulty in this work is that it’s sometimes dangerous to drive at night. But you have a choice, and I always choose to work days rather than nights.
M: Then, what is the best part of your job?
W: I soon found that what I liked best about this job was being outdoors, seeing how the city changes from season to season. And there are places I’ve seen that I probably never would have seen in another job, and I love all kinds of weather. I like to leave the window down in a fine rain. And. and when I have a long drive near the end of the day, I sometimes go past my home to tell my two little children I’ll be home soon, and they always want to come along in my car.
M: Oh, do they? I guess all kids like to be taken for a ride sometimes.
W: Yeah, But you cannot take anyone along unless they pay or you pay for them. So I’ll have to pay their fares one of these days and take them out in my taxi, because they really think it’s fun. Out in the countryside on a long drive, with the air fresh and the sun shining, you just seem to want to drive forever. At least, that’s how it is for me.
M: Being a taxi driver, you have to meet all kinds of people. How do you feel about that?
W: I enjoy meeting many different people. I might not have met some if not for this job, and I’ve learned a lot about how people behave in these years.
M: Can you tell us a bit more about it?
W: The biggest advantage is that you come across various characters in your work. Some people are interesting, some rushed, some pleasant, some funny, some talkative. Some are so pressed for time that they change clothes in the taxi. Those who are in the greatest rush would sometimes forget to pay.
M: Have you ever met someone who doesn’t like women drivers?
W: Yes. Once a passenger really objected to having a woman driver, and I laughed at him so much that he stopped his fussing. Although there has been one or two cases like this, I still think most people are nice to women drivers. So, this is really an interesting part of my work.
M: Now, my last question. Have you ever thought of changing your job?
W: Not yet. I might, in a few years’ time. But not at this moment, because I really enjoy my work, and I do get a lot of satisfaction out of it. So, why should I?
M: Ok. Our interview is coming to the end. I’d like to wind up our interview by wishing you good luck. Thank you very much for your time, Juliet.
W: Pleasure.
1. Why did Juliet become a taxi driver?
2. According to Juliet, what was the most difficult about becoming a taxi driver?
3. What does Juliet like best about her job?
4. What is the character of Juliet as a mother according to the interview?
5. What can we learn about the people Juliet meets? -
第12题：
单选题The most common forms of main drive used on deck auxiliaries are （）.Asteam plants, electric motors and compressed air
Bdiesel engine, hydraulic machinery and compressed air
Csteam plants, electric motors and hydraulic machinery
Ddiesel engines, steam plants and hydraulic machinery
正确答案： D解析： 暂无解析 -
第13题：
He felt ____ rather difficult to take a stand against the opinion of the majority.A.how
B.that
C.it
D.what
答案：C
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第14题：
A
Why do plants grow in some places and not in others? Why does some land have so much growing on it，while other land has almost no plants growing on it at all?
To grow plants need several things． One is warmth． In very cold places almost nothing grows． Plants also need water． In very dry parts of the earth only a few unusual plants can grow． That's why dry deserts everywhere are almost not covered by trees or grass．
Plants must also have a place in which to f，ut down their roots and grow． They find it diffi-culr to grow on hard land． The town is built on hard land． The plants here have only the soil found between the cracks of the stones Io grow in．
Another thing plants must have before they can grow is food．
Whar will happen if we try to make things grow on the sandy beach? A few plants，such as beach grass，will grow in sand，L ut most plants won-t． Even if the weather is warm enough．and we water the plants each day． Many of them will die because the sand on this beach has al-most no food for plants．
( )21． According to the passage，plants need _________ things to grow well．
A． two
B． three
C． four
D． five
正确答案：C
Ⅲ．21．C【解析】通读全文可知：植物的生长需要4个条件：1．适宜的温度；2．水;3．合适的土壤；4.养分。 -
第15题：
共用题干
Plants in Desert
Only special plants can survive the terrible climate of a desert,for these are regions where the annual range of the soil temperature can be over 75℃．Furthermore,during the summer there are few clouds in the sky to protect plants from the sun's ray.Another problem is the fact that there are frequently strong winds that drive small,sharp particles of sand into the plants,tearing and damaging them.The most difficult problem for all forms of plant life,however,is the fact that the entire annual rainfall occurs during a few days or weeks in spring.
Grasses and flowers in desert survive from one year to the next by existing through the long,hot,dry season in the form of seeds.These seeds remain inactive unless the right amount of rain falls.If no rain falls,or if insufficient rain falls,they wait until the next year,or even still the next.Another factor that helps these plants to survive is the fact that their life cycles are short.By the time the water from the spring rains disappears-just a few weeks after it falls-such plants no longer need any.
The perennials（多年生植物）have special features that enable them to survive as plants for several years.Thus,nearly all desert perennials have extensive root systems below ground and a small shoot system above ground.The large root network enables the plant to absorb as much water as possible in short time.
The small shoot system,on the other hand,considerably limits water loss by evaporation（蒸发）.
Another feature of many perennials is that after the rainy season they lose their leaves in preparation for the long,dry season,just as trees in wetter climates lose theirs in preparation for the winter.This reduces their water loss by evaporation during the dry season.Then,in next rainy season,they come fully alive once more,and grow new branches,leaves and flowers,just as the grasses and flowers in desert do.The theme of the second last paragraph is why the perennials can survive as plants for several years.
A:Right
B:Wrong
C:Not mentioned答案：A解析：根据第一段第一句可知，只有特殊的植物才能在沙漠中存活，这是因为沙漠中土壤的温度过高，每年的温度能达到75℃以上，而并不是因为沙漠中的气候变化多端。
根据线索词“Grasses and flowers”和“see1seeas"，可以很快把第二段第一句确定为答案相关句。这个句子的大意是：沙漠里的花草年复一年以种子的形式度过漫长、炎热，而又干燥的季节。可见题干的说法与原文的说法一致，所以选择A项。
题干的大意是：沙漠里春季的雨水很快会消失，而沙漠里生命周期短的花草能够适应这一环境特点。利用题干中的“life cycles”作为线索词，可以很快把第二段第四、五句确定为答案相关句，这两句话表明，生命周期短能帮助植物在沙漠中存活，因为春季的雨水消失后，这些植物将不再需要雨水。可见题干的说法与原文的说法一致。
本篇文章并未提到冬天里花草最难生存，所以选择C项。
利用题干中的“The shoot system”作为线索词，可以把第三段最后一句确定为答案相关句。这句话表明，茎轴系统极大地限制了蒸发所带来的水分损失，而不是说茎轴系统能减少植物对太阳光线的吸收。可见题干与原文的说法不符。
倒数第二段的主题句是第一句，讲述的主要是沙漠多年生植物能生存的原因。题干表述正确，所以选择A项。
根据题干中的线索词“lose their leaves1 "，不难把最后一段第一、二句确定为答案相关句。这两句话表明，沙漠多年生植物和较湿润地区的树木落叶的原因是一样的，都是为了减少水分的蒸发。 -
第16题：
共用题干
第一篇
Plant Gas
Scientists have been studying natural sources of methane（甲烷，沼气）for decades but hadn't regarded plants as a producer, notes Frank Keppler, a geochemist（地球化学家）at the Max Planck Institute for Nuclear Physics in Heldelberg,Germany. Now Keppler and his colleagues find that plants,from grasses to trees,may also be sources of the greenhouse gas.This is really surprising, because most scientists assumed that methane production requires an oxygen-free environment.
Previously,researchers had thought that it was impossible for plants to make significant amounts of the gas. They had assumed that microbes（微生物）need to be in environments without oxygen to produce methane.Methane is a greenhouse gas, like carbon dioxide.Gases such as methane and carbon dioxide trap heat in Earth's atmosphere and contribute to global warming.
In its experiments, Keppler's team used sealed chambers（室，房间；腔）that contained the same concentration of oxygen that Earth's atmosphere has.They measured the amounts of methane that were released by both living plants and dried plant material,such as fallen leaves.
With the dried plants,the researchers took measurement at temperatures ranging from 30 degrees Celsius to 70 degrees C.At 30 degrees C.,they found,a gram of dried plant material released up to 3 nanograms（微克）of methane per hour(One nanogram is a millionth of a gram). With every 10-degree rise in temperature,the amount of methane released each hour roughly doubled.
Living plants growing at their normal temperatures released as much as 370 nanograms of methane per gram of plant tissue per hour. Methane emissions tripled when living and dead plant was exposed to sunlight.
Because there was plenty of oxygen available,it's unlikely that the types of bacteria(bacterium的复数，细菌）that normally make methane were involved. Experiments on plants that were grown in water rather than soil also resulted in methane emissions.That's another strong sign that the gas came from the plants and not soil microbes.
The new finding is an"interesting observation,"says Jennifer Y. King,a biogeochemist（生物地球化学家）at the University of Minnesota in St. Paul. Because some types of soil microbes consume methane,they may prevent plant-produced methane from reaching the atmosphere.Field tests will be needed to assess the plant's influence,she notes.Which statement is true of the methane emissions of plants in the experiment?
A:The lower the temperature,the higher the amount of methane emissions.
B:Living plants release less methane than dried plants at the same temperature.
C:When exposed to sunlight,plants stop releasing methane.
D:The higher the temperature,the greater the amount of methane emissions.答案：D解析：短文的第一段和第二段都讲到，科学家过去曾经认为，沼气必须在无氧的环境中才能产生。注意作者用的是过去式：Most scientists assumed that … , They had assumed that．…
第三段第一句说，科学家使用密封的房间来做实验，房间里氧气的浓度与地球大气中的氧气浓度相仿。所以B项符合原文的意思，其他三个选项则不符合原文内容。
根据第四段和第五段的内容，只有D项是正确的说法。温度越高，沼气的释放量越大，有生命的植物释放的沼气量远大于干燥植物的释放量，在阳光下，它们的沼气释放量是正常情况下的3倍。
最后两段告诉我们，无论在封闭环境中还是在水中生长的植物都能释放沼气，封闭环境中的微生物消耗沼气，使沼气不至于进入大气中。所以选项A、B、C的内容均符合短文最后两段中作者的意思。D项内容短文中没有提到。
从最后一段的第二句可以找到本题的答案。 -
第17题：
He is in a rather difficult situation at present.A: location
B: position
C:preparation
D: station答案：B解析：句意为：他现在的处境较为困难。location意为“位置、地点”, preparation意为“准备、预备”，其动词是prepare ; station意为“站、车站”; position意为“状态、状况、职位”,题目中画线部分的意思是“情形、境遇”，因此B选项符合题意。 -
第18题：
It is important for the teacher to show students how easy it is to understand something from authentic materials rather than how difficult it is to understand everything.（）
A对
B错
对
略 -
第19题：
It is important for the teacher to show students how easy it is to understand something from authentic materials rather than how difficult it is to understand everything.（）
正确答案:正确 -
第20题：
单选题Which of the following best expresses the main idea of Paragraph 2?ABecause of their characteristics as double organisms, it is difficult to classify lichens.
BOver 15,000 varieties of lichens have been identified.
CDouble organisms should always be classified as separate species.
DTaxonomists always find it difficult to classify new species of plants.
正确答案： D解析：
段落大意。第二段第一句指出“地衣是两种植物--真菌和藻类的共同体”，接着本段描述了两者之间互利共生的关系。该段最后一句提到“They can be placed in known classes of fungi but are unlike any species that lives independently.”，可知真菌无法独立生存，因此对其进行分类会很困难。故选项A符合文意。 -
第21题：
判断题It is important for the teacher to show students how easy it is to understand something from authentic materials rather than how difficult it is to understand everything.（）A对
B错
正确答案： 对解析： 暂无解析 -
第22题：
多选题A developer has created a web application that includes a servlet for each use case in the application.These servlets have become rather difficult to maintain because the request processing methods havebecome very large. There is also common processing code in many servlets because these use cases arevery similar. Which two design patterns can be used together to refactor and simplify this web application？（）AProxy
BView Helper
CFront Controller
DSession Facade
EBusiness Delegate
FModel-View-Controller
正确答案： B,E解析： 暂无解析 -
第23题：
单选题Many scientists _____ their own eyes and ears than the theories of the ancients.Awould rather to believe
Bwould rather believe
Crather would believe
Dwill rather believe
正确答案： D解析：
本题考查词语搭配。句意：很多科学家宁愿相信他们自己的见闻也不愿相信古人的理论。would rather do为固定用法，表示“宁可、宁愿”。 -
第24题：
单选题These plants are rather difficult（）Ato look after
Bto be looked after
Cbeing looked after
Dlooking after
正确答案： A解析： 暂无解析