题目内容
-Do you know what speed _______ for a rocket to escape from the pull or gravity of the earth to
send a satellite into outer space?
-No idea at all. I have never got the ______ of it.
send a satellite into outer space?
-No idea at all. I have never got the ______ of it.
[ ]
A. it needs; idea
B. is taken; hang
C. is needed; hang
D. it takes; thought
C
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___ is the most useful invention?
|
A.Do you think which of these |
B.Which of these you know |
|
C.Which of these do you know |
D.You know which of these |
Do you know the stages every inventor must ________ before they can have their invention________ .
|
A.go through; approve |
B.go through; approved |
|
C.get through; approval |
D.look through; approved |