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 spacesuits needn't worry about radiation damage

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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 of grandchildren
D．radiation is not a threat to well protection space explorers

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