单项选择题

The harm radiation has done to the Apollo crew members()

A.is insignificant
B.is enormous
C.seems overestimated
D.remains unknown

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单项选择题
It can be inferred from the passage that()

A.the Apollo mission was very successful
B.protection from space radiation is no easy job
C.astronauts will have deformed children of grandchildren
D.radiation is not a threat to well protection space explorers

单项选择题
According to the first paragraph, the atmosphere is essential to man in that()

A.it protects him against the harmful rays from space
B.it provides sufficient light for plant growth
C.it supplies the heat necessary for human survival
D.it screens off the falling meteors

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