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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.
A. number of wild salmon have been reduced because of uncontrolled deep-sea and coastal netting
B. number of wild salmon is reduced because deep-sea and coastal netting is not controlled
C. numbers of wild salmon has been reduced because of uncontrolled deep-sea and coastal netting
D. wild salmon’s numbers are reduced by deep-sea and coastal netting that is not controlled
E. wild salmon’s numbers have been reduced by uncontrolled deep-sea and coastal netting.
答案选对了 是E 可回来再看发现个问题 E中的numbers为什么要用复数啊（野生的S的数量下降，这里的数量不就是S的数量么？复数什么意思想了很久也不明白~~~）
希望大侠帮忙解答~~~
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发表于 2010-7-17 16:32:54
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