In the second sentence of the last paragraph the word "they" refers__________.
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In the second sentence of the last paragraph, the word "they" refers__________. 查看材料
A.Scientists engaged in the experiments
B.Investigations made by people
C.The resistant strain and the sensitive strain
D.The availability of the two strains
请帮忙给出正确答案和分析,谢谢!
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正确答案:正确C
【答案】C【解析】根据上下文,上一句表明they可能指“thetwostrains”,也可能指investigations,但下句则排除了指代investigations的可能性。
