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先通读短文，掌握其大意，然后从A、B、C、D四个选项中选出一个可以填入相应空白处的最佳答案，并将其标号填入题前括号内。
（一）
It is interesting how NASA chose their astronauts for landing them on the moon. They chose men ___1___ the age of twenty and thirty-five. There were about fifty of them. Many were ___2___ air pilots. ___3___ were scientists with two or three degrees. NASA telephoned each man they were going to choose， told him the plans and the ___4___ they might get in. They then asked him if he was willing to be trained as an astronaut. “How could any man ___5___ such an exciting job？” One of them said， “Dan-generous？ Of course. It’s dangerous ___6___ most exciting.”
The health and physical condition of ___7___ was， of course， very necessary. ___8___ those in very good health and physical condition were chosen.
While being trained to be astronauts， they went through many __9___ They studied the star and the moon， and they also studied geology， the science of rocks. This was necessary 10 astronauts would have to look for rocks on the moon. They would try to find rocks which might help to tell the ___11___ of the moon. They were all ___12___ to fly in helicopters[直升飛机]. These helicopters landed ___13___ down to give them some experience of the way the spaceship would ___14___ land on the moon， They were also taught the ___15___ facts about the conditions in space. They learnt all the technical details of the spaceships and rockets. They visited the scientists and engineers who ___16___ them. They visited the factories where they were ___17___. They learnt how every ___18___ of a space-ship and its instruments work. They also learnt every detail of ground-control ___19___.
In a word， to be chosen as an astronaut， one must be in good health， ___20___ in science and good at piloting.
（ ）1. A. at B. between C. of D. on
（ ）2. A. experienced B. old
C. trained
（一）
It is interesting how NASA chose their astronauts for landing them on the moon. They chose men ___1___ the age of twenty and thirty-five. There were about fifty of them. Many were ___2___ air pilots. ___3___ were scientists with two or three degrees. NASA telephoned each man they were going to choose， told him the plans and the ___4___ they might get in. They then asked him if he was willing to be trained as an astronaut. “How could any man ___5___ such an exciting job？” One of them said， “Dan-generous？ Of course. It’s dangerous ___6___ most exciting.”
The health and physical condition of ___7___ was， of course， very necessary. ___8___ those in very good health and physical condition were chosen.
While being trained to be astronauts， they went through many __9___ They studied the star and the moon， and they also studied geology， the science of rocks. This was necessary 10 astronauts would have to look for rocks on the moon. They would try to find rocks which might help to tell the ___11___ of the moon. They were all ___12___ to fly in helicopters[直升飛机]. These helicopters landed ___13___ down to give them some experience of the way the spaceship would ___14___ land on the moon， They were also taught the ___15___ facts about the conditions in space. They learnt all the technical details of the spaceships and rockets. They visited the scientists and engineers who ___16___ them. They visited the factories where they were ___17___. They learnt how every ___18___ of a space-ship and its instruments work. They also learnt every detail of ground-control ___19___.
In a word， to be chosen as an astronaut， one must be in good health， ___20___ in science and good at piloting.
（ ）1. A. at B. between C. of D. on
（ ）2. A. experienced B. old
C. trained