Research data indicate that there is a great deal of poverty in the United States among single-parent families headed by women. This problem could result from the fact that women’s wages are only 60 percent of men’s. Some economists believe that rigorous enforcement of existing equal pay laws would substantially decrease this wage inequity. But equal pay laws are ineffectual when women and men are concentrated in different occupations because such laws require only that women and men doing the same jobs be paid the same. Since gender concentration exists (for example, 80 percent of clerical workers are women), other economists argue that a comparable worth standard, which would mandate that women and men in any jobs that require comparable training and responsibility be paid the same, should be applied instead. But
    some policy analysts assert that, although comparable worth would virtually equalize male and female wages, many single-parent families headed by women would remain in poverty because many men earn wages that are below the poverty line. These policy analysts believe that the problem is not caused primarily by wage inequity but rather by low wages coupled with single parent hood, regardless of sex. As a solution, they challenge the government’s assumption that a family’s income should depend primarily on wages and urge the government to provide generous wage supplements (child and housing allowances) to single-parents whose wages are low.

The passage suggests that the United States government’s policy towards providing wage supplements to parents whose wages are low is

A.    considered ill advised by most economists who have studied the issue

B.    based on assumptions about the appropriate sources of family income

C.    under revision in response to criticism from some policy analysts

D.    capable of eliminating wage inequality but not of raising incomes for both women and men

E.     applicable to single-parent families headed by women but not to single-parent families headed by men

答案：B。我不明白的地方在于，B选项中提到appropriate一词，这个应该是表示作者的肯定态度的啊，可是原文中对于 government’s assumption是个负评价的啊，是用的challenge一词。请nn多多指教！！！

我相信选B)应该是没有疑问的。

那现在只是需要证明a family’s income should depend primarily on wages与the appropriate sources of family income对等就可以了。这里我们应该可以看出should depend primarily on wages就是wages as the appropriate sources。

至于lz你说的challenge那只是policy analyst的态度与United States government甚至作者的态度并不相关的。