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属于单细胞真核生物 在生态系统中属于生产者 含有DNA和RNA两类核酸 大量繁殖会造成生态危机
the; a a; the 不填；a 不填；the
p∧q p∨（￢q） （￢p）∧（￢q） （￢p）∨q
cross crossing crossed to cross
As far as As long as As good as As well as
生活污水进行脱氮．脱磷处理可以减少水体富营养化 食品袋中装有硅胶的小纸包的作用是防止食品受潮 爆竹燃放过程中，硫燃烧直接生成三氧化硫 草木灰不能与铵态氮肥混合施用
（﹣∞，0）∪（1，+∞） （1，+∞） （0，1） （﹣∞，1）
break down break up break out break off
went up went off went out went away
dozen of books several dozens books several dozens of books several dozen books
that; where which; that where; that which; where
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