if current trends continue, by the year 2010 carbon emissions in the United States will soar to a level more than one-third higher than were those in 1990, according to official projiections.
A. will soar to a level more than one-third higher than were those
B. will soar to a level more than one-third higher than that
C. would soar to a level more than one-third higher than is was
D. would soar to a level more than one-third higher than those
E. would soar to a level more than one-third higher than they were
正确答案是B，不明白的是carbon emissions是复数，为何可以用that指代？
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 considerd 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
正确答案是C，不清楚的地方有两点：一，在这句句子里用what作persue的宾语是否可以？
二，smallpox（天花）是infections的一种，那么当在列举其他infections，如measles和yaws的时候，infections前面为什么不用加other?
请大家各抒己见，谢谢！
Good questions.
In the first question, "that" means "level", not "emissions".
In the second question, I believe "what" can replace "something"
The problem of choice A comes from "of the other infections." The word "the" is not needed b/c it makes the sentence confusing.
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