加强题，被惑了，求解。。。

dq81

答案是D.我第一反应是d,但又觉得d也不对。play outdoor 就说明是沾了soil么，好像不一定，所以不是加强。于是就选了A。结果a是错的。有nn帮忙解释下为什么a错，d对么？谢！
81.(24344-!-item-!-188;#058&000867)



In Arumville, among those young children with elevated levels of lead in their blood, few live in houses containing lead-based paint, but many live in areas where vehicular traffic is heavy.These children's elevated blood-lead levels probably result from lead added to gasoline, since, although gasoline sold in and around Arumville has been lead-free since 1990, lead from vehicle exhaust remains in the soil for many years.

Which of the following, if true, most strengthens the argument?

A. Sales of lead-based paint for use in homes was banned in Arumville in 1977.

B. Vehicle traffic in most residential areas of Arumville is heavier today than it was twenty years ago.

C. Some lead in the soil comes from deteriorating lead-based paint on the exteriors of buildings.

D. In Arumville, children's blood-lead levels typically rise during the warm summer months when children frequently play outdoors but not in the winter when children spend more time indoors.

E. If improperly carried out, the removal of lead-based paint from older houses can significantly increase the risk that children living in such houses will ingest lead dust.

haonan15110

题目先给出一个现象“among.....is heavy", 再给出现象的解释（第二句话），要我们对这个解释做加强，也就是要我们说明：很多住在交通繁忙的地方且很少住在有汞画的屋内的孩子的血汞量上升的原因是泥土中含有以前遗留的汞。因此A根本就无关

dq81

嗯。。。题干问的是which most strengthens the argument. The argument 应该就是指对第二句的解释。所以是对第二句解释的加强。则a为无关选项。好，谢谢！