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
One of the difficulties in carrying out worldwide birth control is that ______.
A．official attitudes to population and birth control vary from country to country
B．different countries have different customs and practices on birth control
C．decreasing birth rate may lead to unemployment in some countries
D．in some countries people think that they enjoy the right to have as many children as they like
单项选择题
According to the passage, a large population will produce a chance for developing ______.
A．agriculture
B．transport system
C．industry
D．national economy
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