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题库 / Prep2008E1-SC-209
In Scotland, the number of wild salmon have been reduced because of uncontrolled deep-sea and coastal netting, by pollution, and by various other threats to the fish's habitat.
number of wild salmon have been reduced because of uncontrolled deep-sea and coastal netting,
number of wild salmon is reduced because deep-sea and coastal netting is not controlled,
numbers of wild salmon has been reduced because of uncontrolled deep-sea and coastal netting,
wild salmon's numbers are reduced by deep-sea and coastal netting that is not controlled,
wild salmon's numbers have been reduced by uncontrolled deep-sea and coastal netting,
题目分析：
有两个习惯表达需积累，the number of+复数名词，谓语动词用单数；a number of +复数名词，谓语动词用复数。
选项分析：
A选项：have been reduced需改为has been reduced，与主语number of wild salmon保持主谓一致；because of uncontrolled deep-sea and coastal netting需改为by uncontrolled deep-sea and coastal netting。这是因为，A, B, and C需要保证A，B，C三者平行。
B选项：A, B, and C平行错误同选项(A)。
C选项：A, B, and C平行错误同选项(A)；the numbers of错误，只有the number of和numbers of；and平行错误同(A)。
D选项：一般现在时are reduced需改为现在完成时have reduced。一般现在时表示的是客观真理和事实，而显然这件事并非“真理”，仅仅是到现在为止的情况。
E选项：Correct. 本选项在语法和逻辑上均是正确的。
平行，主谓一致
the number of is
a number of are
wild salmon's numbers 不是说不要这么表达么
In general, Ron is loath to use apostrophe + "s" for anything but humans, animals, and the like. This is definitely NOT a hard and fast rule, but he has noticed that it's fairly consistent across most usage. Thus, "an ape's vocal tract" is preferred to "the vocal tract of an ape", but "the colors of the mural" is better than "the mural's colors".
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d选项不太理解
C the numbers错误
A主谓一致错误
D that is not controlled不如uncontrolled简洁 现在时需要改成完成时
平行结构
bc选项一样
题目已更正！
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