prep2-17,29

17.The success of the program to eradicate smallpox has stimulated experts to pursue what they had not previously considered possible--better control, if not eradication, of the other infections such as measles and yaws.

(A) what they had not previously considered possible--better control, if not eradication, of the other infections such as

(B) what they had not previously considered a possibility--better control, if not eradication, of such infections like

(C) something they had not previously considered possible-better control, if not eradication, of such infections as

(D) something not considered a previous possibility--better control and perhaps eradication, of other infections such as

(E) the possibility of what they had not previously considered--better control and possibly eradication of infections like

正选C, 问题是解释中说 what和something 出现，应该选something，这是什么原因？what从句用法是什么呢？这个形式是次选吗？

Unlike many United States cities, where a river is no longer the focal point of urban life, the river in San Antonio winds through the middle of the business district, and the River Walk, or Paseo del Rio, is the city's most popular attraction.

(A) Unlike many United States cities, where a river is no longer the focal point of urban life, the river in San Antonio

(B) Unlike the river in many cities in the United States, which is no longer the focal point of urban life, in San Antonio the river

(C) Today the river in many cities in the United States is no longer the focal point of urban life, unlike San Antonio, where it

(D) In few United States cities today, a river is the focal point of urban life, but the river in San Antonio

(E) No longer do many cities in the United States have a river as the focal point of urban life, but in San Antonio the river

正选E, 两个问题

1.答案上说D错误原因是没有no longer,全部否定变成了部分否定，但是few不就是部分否定吗？

2.E,原句的unlike变成了E中的 but, 比较变成了转折，不是句意发生了改变吗？

请朋友们帮忙解决啊，谢谢了！！

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