69. A report by the American Academy for the Advancement of Science has concluded that much of the currentlyuncontrolled dioxins to which North Americans areexposed comes from the incineration of wastes. (A)much of the currently uncontrolled dioxins to which North Americans are exposed comes (B)much of the currently uncontrolled dioxins that North Americans are exposed to come (C)much of the dioxins that are currently uncontrolled and that North Americans are exposed to comes (D)many of the dioxins that are currently uncontrolled and North Americans are exposed to come (E)many of the currently uncontrolled dioxins to which North Americans are exposed come
答案是E 对D选项有些疑问，答案中说如果一定要用that定语从句的话，后半句that不能省略，即应该为 many of the dioxins that are currently uncontrolled and that North Americans are exposed to come 这里是为什么不能省略？ 如果没有省略的话，D选项相对于E选项又差在哪里？
75. Salt deposits and moisture threaten to destroy the Mohenjo-Daro excavation in Pakistan, the site of an ancient civilization that flourished at the same timeas the civilizations in the Nile delta and the river valleys of the Tigris and Euphrates. (A)that flourished at the same time as the civilizations (B)that had flourished at the same time as had the civilizations (C)that flourished at the same time those had (D)flourishing at the same time as those did (E)flourishing at the same time as those were 答案是A 答案对选项D和E的解释中提到，复数代词those不能指代单数名次cicilization,因此缺少指代对象，所有不对 但问题是，正确答案A中，用到的也是复数 civilizations，而非单数，这是为什么 D或者E怎么改才能是正确的？去掉did或者were？答案说他们是unnecessary,用分词短语作修饰部分应该也是可以的吧？
80. New hardy varieties of rice show promise of producing high yields without the costly requirements of irrigation and application ofcommercial fertilizer by earlier high-yieldingvarieties. (A)requirements of irrigation and application of commercial fertilizer by earlier high-yielding varieties (B)requirements by earlier high-yielding varieties of application of commercial fertilizer and irrigation (C)requirements for application of commercial fertilizer and irrigation of earlier high-yielding varieties (D)application of commercial fertilizer and irrigation that was required by earlier high-yielding varieties (E)irrigation and application of commercial fertilizer that were required by earlier high-yielding varieties 这题完全击倒了我，被几个长单词搞晕了，不过我觉得这题的关键在于对意思的完全理解 请大侠帮忙分析下题目的确切含义和语法结构
90. The peaks of a mountain range, acting like rocks in a streambed, produce ripples in the air flowing over them; the resulting flow pattern, with crests and troughs that remainstationary although the air that forms them is movingrapidly, are known as "standing waves." (A)crests and troughs that remain stationary although the air that forms them is moving rapidly, are (B)crests and troughs that remain stationary although they are formed by rapidly moving air, are (C)crests and troughs that remain stationary although the air that forms them is moving rapidly, is (D)stationary crests and troughs although the air that forms them is moving rapidly, are (E)stationary crests and troughs although they are formed by rapidly moving air, is
答案是C 想问E差在哪里？答案说although引导的从句awkward and unclear, 大家能否解释下这怎么讲？
This is an explanation I took from my GMAT instructor:
"Although" is used to separate clauses with verbs. Look at the additive phrase "with stationary crests and troughs although they are formed by rapidly moving air" in E), the subordinator "although" is used after a prepositional phrase, "with stationary crests and troughs", while in C), a clause "crests and troughs that remain stationary" is used before "although". Therefore, E) is incorrect.
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发表于 2010-6-2 23:39:04
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