[单项选择]党的十七大提出加强党的制度建设的重点是（）
A. 健全民主集中制
B. 完善多党合作制
C. 任用干部票决制
D. 落实党建责任制

Passage Four
Women earn less than men do. For example, in 1998 the hourly wages of women in the U. S. were 26% less than those of men. The gap between male and female incomes becomes wider with age. The gap between the labor incomes of young women and young men varies. It’s also clear that jobs in which women are concentrated pay less. The larger the number of workers who are women in an industry, the lower the average wages.
Why do women earn less than men do Are the differences explained by the fact that women are looked down upon If so, the government has to intervene (干预), to force the employers to pay equal wages to equal jobs. However, there is no agreement among economists about the causes of the gap. One view argues that women on the average have chosen low-paid jobs in which workers enjoy the freedom of entering and leaving the labor force, which reduces their years of experience relative to men. Other people say the gap can also be explained
A. young men and young women
B. young women in the same industry
C. middle-aged men and middle-aged women
D. middle-aged women in the same industry