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  3. The word "attenuating"(Paragraph 1) most probably means We can learn from para. 2 that

The word "attenuating"(Paragraph 1) most probably means We can learn from para. 2 that

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问题 The word "attenuating"(Paragraph 1) most probably means
We can learn from para. 2 that
选项 A、a dozen of blood examples were from the patients died between 1986 and 1989.
B、Dr. Arien studied the blood examples to find the cause of AIDS.
C、the subtype of virus involved is different due to different places.
D、3/4 of the viruses appeared to be more harmful than before.
答案C
解析 推理判断题。第二段第二句明确指出十二个血样采自1986到1989年间，而选项A增加了无关信息(died)，可排除；从研究过程和结果来看，Dr. Arien研究的目的并不是艾滋病的成因，而是它的变化情况，排除B；本段中指出Europe and North America和sub-Saharan Africa两个地方的predominant subtype不一样，所以选项C正确；选项D与文义相反。
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