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

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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 space suits needn't worry about radiation damage

单项选择题

Which of the following statements is TRUE

A．Shyness helps us to live up to our full potential.
B．Shyness enables us to understand ourselves better.
C．Shyness blocks our chances for a rich life.
D．Shyness has nothing to do with lack of self-esteem.