Man cannot go on increasing his number at the present rate. In the next 30 ye

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问题 Man cannot go on increasing his number at the present rate. In the next 30 years man will face a period of crisis. Some experts believe that there will be a widespread food【C1】______. Other experts think this is too pessimistic (悲观的) , and that man can prevent things from【C2】______worse man they are now. But remember that two thirds of the people in the world are under-nourished or starving now.
One thing that man can do is to limit the【C3】______of babies born. The need for this is obvious, but it is not easy to achieve. People have to be【C4】______to limit their families. In the countries of the population【C5】______, many people like big families. The parents think that this makes a bigger income for the family and ensures there will be someone in the family who will look【C6】______them in old age.
Several governments have【C7】______birth control policies in recent years. Among them are Japan, China, India and Egypt. In some cases the results have not been successful. Japan has been an【C8】______. The Japanese adopted a birth control policy in 1948. People were【C9】______to limit their families. The birth rate fell from 34.3 per thousand per year to about 17.0 per year【C10】______present. [br] 【C10】

选项 A、for
B、at
C、in
D、until

答案 B

解析 at present“现在，目前”，是固定搭配。

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