問題詳情

Passage 2Microorganisms are the cause 26 many illnesses. Two major 27 of microorganisms arebacteria and viruses. Both are microscopic; that is, people can only see them with a microscope.However, most bacteria are 28 bigger than most viruses. Bacteria can reproduce 29 , butviruses must infect a plant or animal to reproduce. Bacteria can usually be killed by a type ofmedicine called “antibiotics.” However, antibiotics do not kill viruses; in fact, very few medicineskill viruses. The common cold is an example of an illness caused by a virus. Many kinds of foodpoisoning 30 by bacteria.
26.
(A) in
(B) on
(C) of
(D) up

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