【单选题】A team of international researchers has found new evidence that an enered subspecies of chimpanzee is the source of the virus that causes acquired immune deficiency syndrome() in humans. Exper...
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-I