2. 外语
  3. Man cannot continue【C1】______his numbers at the present rate. In the【C2】______thirty years man will face a period of crisis.【C3】

Man cannot continue【C1】______his numbers at the present rate. In the【C2】______thirty years man will face a period of crisis.【C3】

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问题    Man cannot continue【C1】______his numbers at the present rate. In the【C2】______thirty years man will face a period of crisis.【C3】______experts believe that there will be a widespread food【C4】______Other experts think this is【C5】______pessimistic, and that man can keep things【C6】______worse than they are now. But【C7】______that two-thirds of the people in the world are undernourished or starving now.
   One thing that man can do is to limit【C8】______of babies born. The need【C9】______this is obvious, but it is【C10】______to achieve. People have to【C11】______to limit their families. In the countries of the population【C12】______, many people like big families. The parents think that this【C13】______a bigger income for the family and ensures there will be someone in the family who will look【C14】______them in old age.
   Several governments have【C15】______birth control policies in recent years.【C16】______them are Japan, China, India and Egypt. In some【C17】______the results have not been【C18】______. Japan has been an exception. The Japanese adopted a birth control policy in 1948. People【C19】______to limit their families. The birth rate fell from 34. 3 per thousand per year to about 17. 0 per thousand per year【C20】______.
【C19】
选项 A、were encouraged
B、encouraged
C、are encouraged
D、encourage
答案A
解析 in l948为过去时，语态为被动式。
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