2. 专升本
  3. Scientists had to find out many things【C1】______they could land men【C2】______the moon. They needed more【C3】______about space con

Scientists had to find out many things【C1】______they could land men【C2】______the moon. They needed more【C3】______about space con

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问题     Scientists had to find out many things【C1】______they could land men【C2】______the moon. They needed more【C3】______about space conditions and their effect【C4】______human beings. How long can man【C5】______in space? Would the astronauts be able to survive the travel【C6】______the moon? Would they be able to【C7】______their spaceship and get back to【C8】______safely? Would they be able to walk about and work in a weightless【C9】______?
    There was only one way to discover the【C10】______. Men would have to fly into space and【C11】______experiments there.
    It’s【C12】______how NASA chose their astronauts for landing them on the moon. They chose men【C13】______the age of twenty and thirty-five. There were【C14】______fifty of them. Many were【C15】______air pilots, others were scientists【C16】______two or three degrees. NASA telephoned【C17】______man they were going to choose: told him the plans and the dangers they【C18】______get in. They then asked him if he was【C19】______to be trained as an astronaut. "How could any man refuse such an exciting【C20】______?"One of them said, "Dangerous? Of course, it’s dangerous, but most exciting!"
【C7】
选项 A、leave
B、get off
C、board
D、get on
答案A
解析 整句中有对比词get back to。
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