单项选择题

A rabid animal is most dangerous during the early stage of the disease because______.

A．it becomes restless, nervous and violent
B．its bite is fatal
C．the potential danger of the sick animal may be ignored
D．it will attack people at any time
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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
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.
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