标题: 请教: LZM E5-41 [打印本页] 作者: coloruser 时间: 2003-5-8 18:32 标题: 请教: LZM E5-41 If indutrial pollution continues to deplete the ozone layer, the resulting increase in ultraviolet radiation will endanger human health, causing a rise in the indidence of skin cancer and eye disease, ( and perhaps even threatenting) global ecological systems. B) and may even threaten 问： 为什么不是 threat, 为啥要用过去分词？作者: siebel 时间: 2003-5-8 21:31
look up the dictionary, you'll know.作者: 1stzhang 时间: 2003-5-9 18:01
threat是名词，threaten是动词 作者: coloruser 时间: 2003-5-10 08:33
啊呀呀，不好意思，基本功不扎实