单选题
阅读下列短文，从每题所给的四个选项(A、B、C和D)中选出最佳选项。
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Washington—For the first time in history, fewer than one American in four lives in the countryside, the US Census (人中普查) Bureau said on Tuesday. Last year's census found 187.1 million Ameri cans lived in urban are compared with 61.7 million in rural area. America's 200-year flight from the farm has produced crowded towns. Census number show threefourths of the people live on less than 3 percent of the land. There are more than 2 000 people per square mile (772 per square kilometers) in urban America. In the countryside, on average here are 18 people per square mile (seven per square kilometers).

单选题 What's the percentage (百分数) of people living in towns now?

【正确答案】 C

【答案解析】文章第一句提到，．．fewer than one American in four lives in the countryside．．，所以可以推出大于四分之三的人住在城里。

单选题 Towns are now crowded because______.

A、 more and more people have moved from farms to towns
B、 the population is growing fast
C、 there are fewer farms now
D、 there is only a little land for towns

【正确答案】 A

【答案解析】文中提到，America's 200-year flight from the farm has produced crowded towns。答案据此可得。

单选题 How many times more people live in urban areas than in the countryside per square mile?

【正确答案】 C

【答案解析】在城市每平方英里有2 000人，在农村则是18人。两个数据一比较，答案显然选C。