-Do you know what speed _______ for a rocket to escape from the pull or gravity of the earth to send

题目简介

-Do you know what speed _______ for a rocket to escape from the pull or gravity of the earth to send

题目详情

-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.     
[     ]

A. it needs; idea  
B. is taken; hang  
C. is needed; hang  
D. it takes; thought

题型:单选题难度:中档来源:同步题

答案

C

更多内容推荐