A. give away B. give out C. give up D. give off
15. He made a mistake, but then he corrected the situation _____ it got worse.
A. until B. when
C. before D. as
二、完形填空
It is interesting how NASA(美国航空航天管理局)chose their astronauts for landing them on the moon. They chose men 16__ the age of twenty and thirty-five. There were about fifty of them. Many were __17__ air pilots. _ 18__ were scientists with two or three degrees. NASA telephoned each man they were going to choose and told him the plans and the 19 they might get in. They then asked him if he was willing to be trained as an astronaut. How could any man 20 such an exciting job? one of them said. Dangerous? Of course, it's dangerous, 21 most exciting!
The health and physical condition of 22 was, of course, very necessary. 23 those in very good health and physical condition were chosen.
While being trained to be astronauts, they went through many 24 . They studied the stars and the moon, and they also studied geology, the science of rocks. This was necessary 25 astronauts would have to look for rocks on the moon.. They would try to find rocks which might help to tell the 26 of the moon. They were all 27 to fly in helicopters. These helicopters landed 28 down to give them some experience of the way the spaceship would 29 land on the moon. They were also taught all the 30 facts about the conditions in space. They learnt all the technical details of the spaceships and rockets. They visited the scientists and engineers who 31 them. They visited the factories where they were 32 . They learnt how every 33 of a spaceship and its instruments work. They also learnt every detail of ground-control 34 .
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