单选题From the last paragraph we can see that the uses of the laser ______.A are yet to be simplifiedB are expanding all the timeC remain an ideal in imaginationD remain an issue beyond solution
题目
单选题
From the last paragraph we can see that the uses of the laser ______.
A
are yet to be simplified
B
are expanding all the time
C
remain an ideal in imagination
D
remain an issue beyond solution