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

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热门试题

单项选择题

The harm radiation has done to the Apollo crew members______.

A．is insignificant
B．seems overestimated
C．is enormous
D．remains unknown

单项选择题

The main cause of the layoffs in the pottery industry is______.

A．the increased value of the pound
B．the economic recession in Asia
C．the change in people's way of life
D．the fierce competition at home and abroad