GWD6-Q27

Q27:

In Scotland, the number of wild salmon have been reduced because of uncontrolled deep-sea and costal netting, by pollution, and by various other threats to the fish’s habitat.

1. number of wild salmon have been reduced because of uncontrolled deep-sea and coastal netting
2. number of wild salmon is reduced because deep-sea and coastal netting is not controlled
3. numbers of wild salmon has been reduced because of uncontrolled deep-sea and coastal netting
4. wild salmon’s numbers are reduced by deep-sea and coastal netting that is not controlled
5. wild salmon’s numbers have been reduced by uncontrolled deep-sea and coastal netting

答案是E,可以用平行做,但是对numbers有疑问,可以加s吗?