单选题 Before Sept 11, the U.S. Congress had been unable to pass stricter immigration laws be- cause______.

A、 they might have kept away foreign students and cheap labor.
B、 it was difficult to coordinate the efforts of the congressmen.
C、 education and business circles cared little about nation.
D、 resources were not available for their enforcement.

【正确答案】 A

【答案解析】[精解]本题是一道细节题。参看文章第四段的中间“Before Sept．11，legislation of this kind had been blocked by two powerful lobbies：universities，which rely on tuition from foreign students who could be kept out by the new law，and business，which relies on foreigners for cheap labor”说明移民政策的修改不能够保护大学生和廉价劳动力的利益。
A．他们远离大学生和廉价劳动力的利益。在原文中可以找到依据。
B．议会成员的努力很难协调起来。
C．教育和商业部门很少关心国家。
D．资源不能够满足他们政策的执行。
B，C，D三项都在原文中找不到依据。