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

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热门试题

单项选择题Which of the following best describes why the restrictive banking laws of the 1930s are still on the book

A．The bank failures of the 1930s were caused by restrictive courts.
B．Banking has not changed in the past 50 years.
C．The banking system is too restrictive, but on alternatives have been suggested.
D．Legislators apparently believe that banking problems similar to those of the Depression still exist today.

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

单项选择题The reason some children are backward in speaking is most probably that _______.

A．they are incapable of learning language rapidly
B．they are exposed to too much language of once
C．their mothers respond inadequately to their attempts to speak
D．their mothers are not intelligent enough to help them

单项选择题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-I

单项选择题What is exceptionally remarkable about a child is that ______.

A．he is born with the capacity to speak
B．he has a brain more complex than an animal's
C．he can produce his own sentences
D．he owes his speech ability to good nursing