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

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 detormed children or grandchildren
D．radiation is not a threat to well-protected space explorers

单项选择题

Which of the following may be the best reason for casual dining

A．Family members need more time to relax.
B．Busy schedules leave people no time for formality.
C．People want to practice economy in times of scarcity.
D．Young people won't follow the etiquette of the older generation.