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  .

In a word, to be chosen as an astronaut, one must be in good health,  35   in science and good at piloting.

16. A.at    B.between     C.of       D.on

17. A.experienced   B.old    C.trained    D.young

18. A.None   B.Few     C.Others     D.They

19. A.dangers  B.sadness    C.hardship    D.troubles

20. A.accept  B.receive     C.offer       D.refuse

21. A.but    B.if      C.though     D.however

22. A.scientists  B.men    C.pilots    D.young people

23. A.As     B.Only     C.If      D.Or

24. A.jobs     B.places    C.courses     D.ways

25. A.for     B.because   C.since      D.so that

26. A.story  B.background    C.age       D.name

27. A.shown   B.trained    C.told      D.let

28. A.straight   B.just     C.indirectly     D.directly

29. A.possibly  B.likely    C.actually    D.really

30.A.not known   B.well-known  C.unknown   D.known

31. A.drew  B.produced   C.designed   D.made

32. A.repaired  B.built   C.developed   D.fixed

33. A.part  B.movement   C.machine   D.body

34. A.house  B.stop    C.system     D.station

35. A.well-done    B.well-fed 

C.well-kept     D.well-informe

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