第4题: [单项选择]Why will the population in poorer countries increase A. Because they need more labor to support the family. B. Because the people have the habit to have a big family. C. Because the people there are poorer. D. Because the people there want to be rich. 参考答案:A 答案解析:推断题。从第二段可以看出,在贫穷国家他们需要更多的劳力来支撑家庭的负担。错误选项说明:B)文中没有提到习惯的问题;C)不是人口增长的原因;D)文中没有提到。