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Man cannot continue 【26】 his numbers at the present rate. In the 【27】 thirty years man will face a period of crisis. 【28】 experts believe that there will be a widespread food 【29】 Other experts think this is 【30】 pessimistic, and that man can keep things 【31】 worse than they are now. But 【32】 that two-thirds of the people in the world are undernourished or starving now.
One thing that man can do is to limit 【33】 of babies born. The need 【34】 this is obvious, but it is 【35】 to achieve. People have to 【36】 to limit their families. In the countries of the population 【37】 ,many people like big families. The parents think that this 【38】 a bigger income for the family and ensures there will be someone in the family who will look 【39】 them in old age.
Several governments have 【40】 birth control policies in recent years. 【41】 them are Japan, China, India and Egypt. In some 【42】 the results have not been 【43】 . Japan has been an exception. The Japanese adopted a birth control policy in 1948. People 【44】 to limit their families. The birth rate fell from 34.3 per thousand per year to about 17.0 per thousand per year 【45】 .
【正确答案】
B
【答案解析】continue 后既可跟动词不定式，又可跟动名词形式，但意义略有差别。continue to do sth．暗指动作的间断性，同时动词不 定式又指将来时，而 continue doing sth．则强调动作的持续无间断。continue with 后不跟动名词。此句强调动词将来时。
【正确答案】
C
【答案解析】句中的 will 指明本句的时态为一般将来时。next 强调将 来；recently 为现在完成时的标志；second 则强调时间范围的次序性。
【答案解析】根据上下文可知some experts 与 other experts 的观点相对 应，此句指另一些专家认为前者的观点太过悲观，所以 too 较适 当，因为 too 强调程度之“过”，含有否定、异议的感情色彩。
【正确答案】
B
【答案解析】keep sb. from doing sth．为固定搭配，此外 prevent／stop sb．(from)doing sth．均为“阻止某人做某事”之意。
【正确答案】
A
【答案解析】此句为祈使句，所以要用动词原形。
【正确答案】
D
【答案解析】limit the number of babies born 即控制婴儿的出生数量。关 于a number of 与 the number of 的区别如下：a number of = many，a lot of，意为“许多，大量”；the number of 则为单数概念，强调数量的 具体值，因此其后要跟谓语或 be 动词的第三人称单数形式。
【正确答案】
A
【答案解析】need此处用做名词。need for (of) sth．均为固定搭配， 即“某事的必要性”。如：have need for(of)sth.，be in need of 需要;at need 急需。虽然 need for sth．与 need of sth．意思相同，但for的语气要比 of 强烈。