They think they should help to protect______(野生动物)

问题描述:

They think they should help to protect______(野生动物)

wild animals

~~~~回答简明扼要,欢迎追问.(*^__^*) ~~~~能否用 "to watch"?你看错题了吧?能否用"wildlifes"?不行,那是“野生动植物”。They think they should help to protect______(野生生物).wildlifes我也是这样回答的,可是老师却给我去了“s“,仔细想想是否加”s“?额,不加s。wildlife为什么不加“s“?这个词就没有复数。