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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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.

单项选择题

The first paragraph is mainly about ______.

A．the characteristics of shy people
B．the cause of shyness
C．the questions in the minds of shy people
D．the effect of shyness on people