[求助]新prep1，209

209.       (29580-!-item-!-188;#058&004295)       (T-3-Q7)

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,

我早就想问这道题了，一直没找着，今天可逮着了。讨论帖里还没有，，，，

看见正确选项后我确实明白了后面的三个by并列，那么请教的是：

一，我们知道 the number of表数量，the numbers of万恶不赦。那么
                wild salmon’s numbers 是否也代表沙丁鱼的数量的意思呢？

二，这里如何辨别完成时与现在时？

第一个问题是个好问题. 查了一下,有惊人的发现:

http://www.telegraph.co.uk/news/uknews/1329610/Salmon-farming-has-hit-wild-fish-stock.html

这只是其中一个.发现很多报章都是写"the wild salmon numbers are..."

请NN们解释一下了~

至于第二题,gmat的规则是,在没有时间或逻辑提示下,要保留原句的时态.

嗯，我觉得也只好按我那样理解了。。。。原来看过一个高分大牛好像提起过这事，但追问了一句没理我。。。