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英语上的几个问题1.evident作名词讲时前面是加a还是an?why?2.The problem of acid ra

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英语上的几个问题
1.evident作名词讲时前面是加a还是an?why?
2.The problem of acid rain appeared with th Industrial Revolution,and it has been growing ever since.(ever since 它是怎么用的啊?)
3.The widespread destructiveness of acid rain.destructiveness是什么意思?字典上查不到
4.Industrial emissions have been blamed as the major cause of acid rain.翻译下
英语上的几个问题1.evident作名词讲时前面是加a还是an?why?2.The problem of acid ra
1.an,因为evidence 元音开头,an evidence.不过常见的是 a piece of evidence,作不可数
2.ever since 自此以后,用于完成时中,“从那时以后就不断增长”
3.酸雨的严重危害性到处蔓延.destrutiveness 是destrucive 做属性时的名词形式.一般常见的是destruction,但是这里需要destructiveness形容破坏力.
4.工业废气排放被认为是酸雨形成的罪魁祸首.