1. Tiny quantities of more than thirty rare gases, most of them industrial by-products, threaten to warm the Earth’s atmosphere even more rapidly than carbon dioxide during the next fifty years.
(A) to warm the Earth’s atmosphere even more rapidly than carbon dioxide during the next fifty years
(B) to warm the Earth’s atmosphere even more rapidly over the next fifty years than carbon dioxide will
(C) during the next fifty years to warm the Earth’s atmosphere even more rapidly than carbon dioxide
(D) a warming of the Earth’s atmosphere during the next fifty years even more rapid than carbon dioxide’s（B）
(E) a warming of the Earth’s atmosphere even more rapid than carbon dioxide’s will be over the next fifty years
关于AB选项的一点个人看法——
大全说选项应该是B.
可是B当中有两个是属于原则性的错误：
1.Over the next fifty years应该是说过了next 50years之后，因为over是“越过”，“超出“的意思。这个时间范围首先和原文不符。
2.根据OG中无处不见到让人觉得烦得像祥林嫂一样的平行对称原则，carbon dioxide之后的谓语也应该是一般现在时，而不是will。
而A选择的唯一问题不过是有效性的问题，也就是than后面没有补出助动词。
相对于B的两个原则性错误，我想似乎A更为适合。
不知道是不是A中是不是有其他问题？
望各位好心人指路。
866, sec07-23
A) during the next fifty years位置不好, 会有carbon dioxide during the next fifty years的意思; 且有gases threaten to warm atmosphere more rapidly than （gases threaten to warm )co2产生歧义, than后应加助动词避免歧义。
B) best。over the next fifty 和 more rapidly 一样是修饰前面的动词warm, 而非threaten。
threaten to warm the Earth’s atmosphere even more rapidly over the next fifty years than carbon dioxide will（warm the Earth’s atmosphere）
C) than后应加助动词避免歧义。during the next fifty years位置也不十分好, 更合理的是修饰to warm, 否则时态不好理解。
D) 应threaten to do
E) 同上。
以上摘自大全注释。
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