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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单项选择题

What can we do to avoid the waste of paper

A．Learn to make notepads from unused sides of paper.
B．Cut down on paper consumption.
C．Teach children not to litter.
D．Stop using paper towels.

单项选择题

What does the speaker suggest people should do when they go shopping

A．Avoid over-packaging products.
B．Use cloth napkins and cloth towels.
C．Not buy any products with plastic wraps.
D．Take their own bags to hold things in.