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
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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
单项选择题
Refined table manners, though less popular than before in current social life,______.
A．are still a must on certain occasions
B．are bound to return sooner or later
C．are still being taught by parents at home
D．can help improve personal relationships
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