问题描述：
Why our only true enemy is bacteria?
A.they are too small to eradicate
B.their mutation rates are very rapid,therefore their evolution rate is increased
C.they are the first form of life to appear on our planet
D.most are harmless
And why?
A.they are too small to eradicate
B.their mutation rates are very rapid,therefore their evolution rate is increased
C.they are the first form of life to appear on our planet
D.most are harmless
And why?
问题解答：
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