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

According to the writer, self-awareness is ______.

A．harmful to people
B．a weak point of shy people
C．the cause of unhappiness
D．a good quality

单项选择题

What is the shy people's reaction to compliment

A．They are pleased by it.
B．They feel it is not true.
C．They are very sensitive to it.
D．They feel it confirms their inferiority.