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
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
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单项选择题
To food a large population, ______.
A．inferior land must be cultivated
B．good land must work intensively
C．each person must produce less
D．Both A and B.
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