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6. In late 1997, the chambers inside the pyramid of the Pharaoh Menkaure at Giza were closed to visitors for cleaning and repair due to moisture exhaled by tourists, which raised its humidity to such levels so that salt from the stone was crystallizing and fungus was growing on the walls.
(A) due to moisture exhaled by tourists, which raised its humidity to such levels so that salt from the stone was crystallizing
(B) due to moisture that tourists had exhaled, thereby raising its humidity to such levels that salt from the stone would crystallize
(C) because tourists were exhaling moisture, which had raised the humidity within them to levels such that salt from the stone would crystallize
(D) because of moisture that was exhaled by tourists raising the humidity within them to levels so high as to make the salt from the stone crystallize
(E) because moisture exhaled by tourists had raised the humidity within them to such levels that salt from the stone was crystallizing
OG的解释C,D,E:
C The pronoun them seems to refer to tourists, which is nonsensical; the entire construction is awkward and wordy; would crystallize is not parallel to was growing.
D Once again, them seems to refer to tourists; the entire construction is awkward, wordy, and ambiguous; crystallize is not parallel to was growing.
E Correct. The causal sequence is clear, and them clearly refers to chambers.
我一直都没有弄懂，为嘛D里的them有指代歧义，但是E里的就没有了，这到底是为什么。。。。
21.Neuroscientists, having amassed a wealth ofknowledge over the past twenty years about the brainand its development from birth to adulthood, are nowdrawing solid conclusions about how the human brain grows and how babies acquire language.
(A)Neuroscientists, having amassed a wealth ofknowledge over the past twenty years aboutthebrain and its development from birth toadulthood, are
(B)Neuroscientists, having amassed a wealth ofknowledge about the brain and its developmentfrom birth to adulthood over the past twentyyears, and are
(C)Neuroscientists amassing a wealth of knowledge about the brain and its development from birthto adulthood over the past twenty years, and are
(D)Neuroscientists have amassed a wealth ofknowledge over the past twenty years about thebrain and its development from birth to adulthood,
(E)Neuroscientists have amassed, over the pasttwenty years, a wealth of knowledge about thebrain and its development from birth to adulthood
OG解释：
A Correct. The explanatory phrase betweenthe subject and predicate is set off bycommas, and the mainclause contains botha subject (Neuroscientists) and acorresponding verb (are now drawing).
B And are indicates that are follows a previousverb, but in fact the sentence has not yetprovided a first main verb for the subjectNeuroscientists; the sentence is thereforeincomplete; over the ... years appears to be modifying adulthood.
C Amassing, like having amassed, functions asan adjective, not a verb; the sentencetherefore lacks thefirst main verb impliedby the compound verb construction and arenow drawing....
D The final descriptor in present tense, nowdrawing conclusions ... does not fit theopening clause, which is in present-perfecttense (have amassed a wealth ...) and seemsto modify adulthood.
E Like D, this sentence attempts to attach apresent-tense descriptor to a present-perfectclause.
不明白D、E是什么意思？是说句子是现在完成时，故这里用---ing的形式是错的吗？但是这里启的是分词的作用啊，迷惑。。。
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发表于 2010-8-13 14:49:04
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