Where is the experimental AIDS vaccine tested? According to the context, what does the underlined word "strain" in paragraph 4

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问题 Where is the experimental AIDS vaccine tested?
According to the context, what does the underlined word "strain" in paragraph 4 mean?

选项 A、Disease
B、Breed
C、Virus
D、Cell

答案B

解析词义推测。根据常识，我们能推测出这是另一种类型的艾滋病，而非细胞或病毒，A也不对，因为艾滋病本来就是一种病。

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考研英语一

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