Why our only true enemy is bacteria?

Why our only true enemy is bacteria?

题目
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?
答案
B.因为它们易变异,繁殖快.
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