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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。
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。
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