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题库 / Prep2007E2-SC-1
Since the start of the space age, more and more littering has occurred in orbits near Earth, often because the intentional discarding of lens caps, packing material, fuel tanks, and payload covers.
more and more littering has occurred in orbits near Earth, often because
orbits near Earth have become more and more littered, often from
orbits near Earth became littered more and more, often resulting from
there have been more and more littering of orbits near Earth, often because of
there had been littering more and more of orbits near Earth, often with
题目分析：
本题的意思是：自从人类有能力发生卫星，在地球的轨道周边就开始有越来越多的垃圾，经常是来自于某些有意丢掉的油箱什么的。
选项分析：
A选项：语法有误。最后一个词because是连词，其身后必须连接一个句子，不能是一个名词短语。
B选项：Correct. 本选项在语法和逻辑上均是正确的。
C选项：often resulting from the intentional discarding of lens caps, packing material, fuel tanks, and payload covers是一个现在分词短语。在语法上，句末出现的现在分词短语通常都是伴随状语。因此，result的主语只能是其所修饰的句子的主语orbits。在逻辑上，“轨道”不能是“有意丢掉油箱等废物”的结果。
D选项：there be句型的核心词是“有”。即，本句主干的意思是：
这里有很多垃圾。
在逻辑上，“有意丢掉油箱”结果应该是“地球轨道周围变得越来越脏”，而不是“这里有很多垃圾”。（只有地球周边会变得垃圾越来越多，因为故意丢弃的东西都是地球人弄出的东西）
E选项：本选项错误同(D)。
A，becaus后面只能接句子
C，you can't use 'resulting from' as an adverbial modifier, as is done here. in general, 'resulting from' is only used as an adjective modifier, almost always without a comma, as in
the pollution resulting from the chemical spill forced all the local residents to evacuate.
DE：there is nothing wrong with saying 'there is x'. this construction is basically equivalent to 'x exists' (if x is a thing), or 'x happens' (if x is an event).
the problem, though, is that "the intentional discarding of lens caps, packing material , fuel tanks and payload covers" IS the "littering".
so, sentences D and E are not logical.
because of' must be followed by SOMETHING ELSE that is actually the cause of something.
'with' should be followed by a component or part of the previous observation.
note that the correct answer is phrased in a way that removes this problem.
the correct answer says "orbits ... have become more and more littered". in this version, "littered" means roughly the same as 'dirty' or 'polluted'.
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