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
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
We know from the passage that ______.
A．exposure to even tiny amounts of radiation is fatal
B．the effect of exposure to radiation is slow in coming
C．radiation is avoidable in space exploration
D．astronauts in space suits needn't worry about radiation damage
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