单选题 The passage states that, before the twentieth century, which of the following was true of many employers?

A、 They did not employ women in factories.
B、 They tended to employ single rather than married women.
C、 They employed women only in those jobs that were related to women' s traditional household work.
D、 They resulted technological innovations that would radically change women' s roles in the family.

【正确答案】 B

【答案解析】[试题分析] 本题考查学生对文章细节内容的理解及一定的推理能力。
[详细解答] 文章第二段谈到技术革新，如纺织机、缝纫机、打字机、吸尘器的发明并没有导致妇女的经济地位及妇女工作的普遍评价发生同样巨大的社会变化，根据此句，我们可排除选择项D。从“The employment of young women in textile mills during the Industrial Revolution was．．．of young，single women as domestics”及“The increase in the numbers of married women employed．．．in the twentieth century”，可知在二十世纪已婚妇女工作的人数才增加，那么在二十世纪之前，工厂更倾向于雇用未婚的年青妇女。应选B。