加拿大华人论坛 加拿大生活信息新概念四中句子理解
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Snakes did not acquire their poison for use against man but for use against prey such as rats and mice, and the effects on these of viperine poison is almost immediate.其中的句子the effects on these of viperine poison is almost immediate.正常顺序应该是the effects (of viperine poison) on these is almost immediate.主语是effects，那be动词为什么用is呢？
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回复: 新概念四中句子理解我也觉得不理解。
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回复: 新概念四中句子理解effects 应被视为单数
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回复: 新概念四中句子理解these=rats and mice
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