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　　6. 还有一道题目考they their指代不清，包含这些代词的都不选。

　　考点：

　　1.代词指代模糊：(来自RON)

　　if you see an AMBIGUOUS PRONOUN that is SPLIT AGAINST A SPECIFIC NOUN -- i.e., it is replaced by a specific noun in other answer choices -- then you can probably feel safe in eliminating it.

　　if the ambiguous pronoun is NOT split against a specific noun, then you may want to think twice about eliminating it.

　　here, there's no specific noun in opposition to "them" (i.e., you don't see "them" vs. "those chambers" in other choices). so the ambiguity is not an issue worth thinking about.

　　相关练习：

　　(来自OG13-8)

　　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 bv 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

　　Agreement;Parallelism

　　The plural subject chambers requires plural pronouns. The sentence explains a causal sequence: visitors' breath introduced moisture that caused salt to crystallize, which caused the chambers to be closed for cleaning and repair. The phrase due to makes this causal sequence somewhat ambiguous, seeming to suggest that the repairs were due to humidity from visitors' breath.

　　A Due to is an imprecise expression of the causal connection between the tourists' breath and the closing of the museum for cleaning; the singular pronoun its does not agree with the plural antecedent chambers.

　　B It is not at all clear what the reference is for the pronoun its; fungus was growing should be parallel to salt... was crystallizing (not

　　would crystallize) because it is another effect of the humidity.

　　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.

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