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【单选题】

Many AIDS experts are not completely satisfied with results of the study because ______.
A.only a limited number of chimpanzees are used for sampling the virus.

B.it is now extremely difficult to find chimpanzees that carry the virus.
C.the samples collected are from two different subspecies of chimpanzees.
D.it does not provide reliable evidence of the link between SIV and HIV - 1.
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根据网考网移动考试中心的统计,该试题:

81%的考友选择了A选项

16%的考友选择了B选项

2%的考友选择了C选项

1%的考友选择了D选项

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