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It is interesting to learn about how astronauts are chosen to go to the moon. Some
astronauts are 1 air pilots who enjoy flying in the sky. Many of them are scientists with
more than one degree. They are usually chosen 2 their twenties and thirties. The physical
condition of pilots cannot be emphasized more in this 3 . Only those in very good health
and physical condition are chosen. While being trained to be astronauts, they have to 4 many
courses to gain knowledge about the moon. For example, they have to study science of rocks.
This is necessary because astronauts will have to look for rocks on the moon. Among all the
rocks they have found, they will have to study specific patterns of rocks that would help
them 5 the age of the moon. That is one of the important missions for astronauts. 【題組】2. (A) at (B) for (C) in (D) on
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