The second paragraph intends to tell us about ______.
A. general traits of the Americans
B. the reason why Americans tolerate and accept different family types.
C. the social customs in American society
D. the result of the social changes.
How many types of families are mentioned by the writer？
A. Six.
B. Two.
C. Five.
D. Four.
What percent did the families headed by one parent account for？
A. 50 percent.
B. 40 percent.
C. 35 percent.
D. 22.5 percent.
如果农村劳动力城市就业每年以100万人口递增，就业领域的比例不变，那么到2008年初商业饮食业的农村劳动力达到()。
A. 440万人
B. 450万人
C. 430万人
D. 460万人
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