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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
make it take it reach for it catch up with it
（﹣∞，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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