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  3. The causes of most disease, parasites such as viruses, bacteria, and fungi, all specialize in breaking into cells, either to eat

The causes of most disease, parasites such as viruses, bacteria, and fungi, all specialize in breaking into cells, either to eat

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问题 The causes of most disease, parasites such as viruses, bacteria, and fungi, all specialize in breaking into cells, either to eat them, as fungi and bacteria do, or, like viruses, to subvert their genetic machinery for the purpose of making new viruses. Either way, parasites must get into cells. To do that, they employ protein molecules that bind to other molecules on cell surfaces. The struggle between parasites and their hosts is all about these binding procedures.
The word them in the passage refers to
选项 A、parasites
B、viruses
C、cells
D、bacteria
答案C
解析 The main clause states that parasites, viruses, and bacteria all specialize in breaking into cells. The object of the action is cells. Logic tells you that the object pronoun them refers to cells.
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