3天后考试，急问几道语法题PREP

124.
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Whereas the use of synthetic fertilizers has greatly expanded agricultural productivity in many parts of the world, an increase in their use can create serious environmental problems such as water pollution, and their substitution for more traditional fertilizers may accelerate soil structure deterioration and soil erosion.

(A) an increase in their use can create serious environmental problems such as water pollution, and their substitution for more traditional fertilizers

(B) an increase in their use can create serious environmental problems like water pollution, and if substituted for more traditional fertilizers, it

(C) if these fertilizers are used increasingly, they can create serious environmental problems such as water pollution, and if used as substitutions for more traditional fertilizers, they

(D) the increased usage of these fertilizers can create serious environmental problems such as water pollution, while if substituted for more traditional fertilizers, this substitution

(E) the increased usage of these fertilizers can create serious environmental problems like water pollution, while their substitution for more traditional fertilizers

答案是A，但是我做的时候马上就把A排除掉了，whereas后面的成分：the use of...好像和A的an increase in their use不一致啊！

怎么能选呢？？？？？？？？？

(B) The former

(C) Former

(D) She was

(E) As the

这道答案选E，解释没看懂。。。。。

The spectacular disintegration of a comet last year in full view of ground- and space-based telescopes provided new insights into how comets form and may thus force a rethinking of the role of comets in the delivery of organic compounds to the evolving Earth.

(A) The spectacular disintegration of a comet last year in full view of ground- and space-based telescopes provided new insights into how comets form and may thus force

(B) The spectacular disintegration of a comet last year in full view of ground- as well as space-based telescopes, provided new insights into how comets form and thus possibly forcing

(C) When a comet's spectacular disintegration occurred in full view of ground- and space-based telescopes last year, it provided new insights into how comets form and thus may possibly force

(D) Last year, in full view of ground- and space-based telescopes, a comet's spectacular disintegration provided new insights into how comets form and thus possibly forcing

(E) Last year, in full view of ground- as well as space-based telescopes, the spectacular disintegration of a comet has provided new insights into how comets form and may thus force

这道选A，可我怎么看都不觉得provided和force是平行的呀？

8.    (24773-!-item-!-188;#058&001691)

Ozone, a special form of oxygen that screens out harmful ultraviolet rays, reaches high concentrations twelve miles above Earth, where it has long appeared that it was immune from human influence; we have now realized, though, that emissions of industrial chlorofluorocarbons deplete the ozone layer.

(A) has long appeared that it was immune from

(B) has long appeared to have been immune from

(C) has long appeared as being immune to

(D) had long appeared immune to

(E) had long appeared that it was immune to

正确答案选D，可是我不明白为什么要用过去完成时呢，原句里有reaches那不是造成断层了吗？？？

顶下。。。

考虑第一题 an increase in their use can create serious environmental problems such as water pollution, and an increase in their substitution for more traditional fertilizers 觉得这两个应该是这样的并列关系，这里是一个省略结构,

D，E的the increased usage 明显改变重心了,而B,E用like举例排除，Ｃ是随意改变句子成分，所以选Ａ

第二题里Ｂ，Ｃ，Ｄ都可排除，因为逗号不能直接联系两个句子

至于Ａ和Ｅ我觉得可能是意思方面的问题，作为前任主席和作为主席,个人认为JP参加那么多会议，审查那么多申请与他是不是前任无关，只是因为他是主席而已，且这里也无对比，所以排除Ａ

汗,看错了D是句子,B,C不是...B,C是意思不对,应该是作为主席,且不该有比较...

最后一个问题我觉得是因为where引导的句子是发生在过去且已经是完成的，所以是过去完成时，而前面的reach是在讲一个客观规律，所以只用一般时即可．．．

以上纯粹个人观点，欢迎讨论...

ＰＳ．汗..不过第一次选时我都选错了，以上分析仅做参考－　－

up~~~