单项选择题

Research in the early 19th century showed______.

A．rabies was an infectious disease
B．man and all warm-blooded animals were easily infected with rabies
C．stray dogs should be destroyed
D．the disease had been permanently eliminated in some big cities
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单项选择题
Which of the following statements is TRUE
A．Any animal can be infected with rabies.
B．The speed with which the disease develops depends partly on the distance of the wound from the brain.
C．The first vaccine experiment on a human being proved to be a failure.
D．A dog gets life-long protection from one powerful injection of the vaccine.
单项选择题
The successful attempt to save a badly bitten boy in 1885 was based on the theory that______.
A．infective agent of rabies could be used for vaccination
B．a series of injections of new virus could make people resistant to rabies
C．the infective agent of rabies could be recovered from the infected body
D．the longer incubation period would enable human body to build up enough resistance
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