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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
signs examples symbols marks
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
so great honor such great honor so great an honor such great an honor
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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