题目内容

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

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_________his address, I can ' t send this book to him.
[ A] Not knowing
[ B ] Knowing
[ C] Not know
[ D] Not known

[A]mixed
[B]strong
[C]personal
[D]warm

The author' s main purpose in the second paragraph is to_________ .
[A] discuss the problem of handling trash
[B] suggest ways to cope with traffic problems
[C] point out the disadvantages of heavy traffic
[D] propose an alternative system of transportation

[A]although
[B]but
[C]besides
[D]for