单项选择题

The female the author is narrating in this text ______.

A．lives in New Jersey
B．gets off at the 175th street station
C．says to him, "Nice day, isn't it"
D．carries a newspaper or a book on the way
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单项选择题
Since chimpanzees are genetically very similar to humans, ______.
A．chimpanzees are likely to suffer AIDS just like humans if they are infected.
B．it does not matter if human beings are infected with SIV rather than HIV - 1.
C．we can use human vaccines to prevent chimpanzees from getting AIDS virus.
D．AIDS vaccines based on chimp' s immune mechanism are possible to be made.
单项选择题
The biggest worry that the researchers now have is ______.
A．more and more wild chimpanzees are being slaughtered.
B．AIDS virus is difficult to be killed and controlled.
C．it is not easy to repair people' s deficient immune systems.
D．many dangerous viruses are being transmitted to humans.
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