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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)。
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.
became littered more and more： implies that the littering is happening with increasing frequency.
In #C there's no NOUN that serves as the focus of the modifier 'resulting from...' (an adjective-type modifier). It's intended to modify the general idea that the orbits have become littered, but there's no NOUN that signifies the littering.
1. 句首since the start of the space age表示从过去开始持续到现在的时间，因而主句的谓语动词应使用现在完成时，由此排除C/E；
2. A：often because中Because是连词，后面需接完整的句子，而不是名词短语。because of + 名词短语。排除A；
3. C：除应使用现在完成时外，littered more and more应该是more and more littered。而often resulting from做状语，修饰前面整个句子，解释为什么会more and more littered，是正确的修饰。
4. D：littering of orbits near Earth中of应是in，表示在orbits near Earth中存在越来越多litter。此外，there be举行是“有...”的意思，违背了原句“orbit越来越脏”的逻辑意思，排除D；
5. E：E选项在时态、语法和逻辑意义上都存在很大问题，排除E；
6. B：正确选项，前半句好理解，而后半句是见得较少的，需学习此种用法。
the non-underlined portion of the sentence doesn’t tell us about the reason of the littering. It is telling the ways (or the sources) of littering.
不能说，我导致我，垃圾导致垃圾。 Using "because" means "the intentional discarding of lens caps..." led to littering. In fact, "the intentional discarding of lens caps.." is littering itself
became more and more littered :means that the degree of littering in the orbits has increased;
became littered more and more: implies that the littering is happening with increasing frequency.
我看到国外有题目是A选项里是Because of
A because后接了个名词短语
C resulting 作伴随状语的主语是轨道错！同时 since是现在完成时的标志
D E there have been错！