单项选择题


A．better
B．less
C．worse
D．finer
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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
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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