单项选择题

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

A．is significant
B．seems overestimated
C．is enormous
D．remains unknown
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单项选择题
The best title for this passage would be ______.
A．The Atmosphere and Our Environment
B．Research on Radiation
C．Effects of Space Radiation
D．Importance of Protection Against Radiation
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 explorers
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