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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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

单项选择题

______I'd like to, I can't come.

A．Much though
B．Though much
C．Much as
D．As much