单项选择题

The harm radiation has done to the Apollo crew members ______.

A．is insignificant
B．seems overestimated
C．is enormous
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 or grandchildren
D．radiation is not a threat to well-protected space explores
单项选择题
According to the writer, self-awareness is ______.
A．harmful to people
B．a weak point of shy people
C．the cause of unhappiness
D．a good quality
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