单项选择题

A．Storms and floods.
B．Disease and fire.
C．Rapid increase of the animal population.
D．Less space for their growth.
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A．Baby—the Parrot Detective.B．An Amazon Parrot.C．Rising Crime Rates in American Society.D．How to Protect Your House.
A．Baby—the Parrot Detective.
B．An Amazon Parrot.
C．Rising Crime Rates in American Society.
D．How to Protect Your House.
单项选择题
According to the passage, alcohol has something to do with bad breath mainly because______.
A．it keeps offending bacteria from reproducing
B．its smell adds to bad breath
C．it kills some helpful bacteria
D．it affects the normal flow of saliva
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