单项选择题

A．She is forgetful.
B．She is considerate.
C．She is forgiving.
D．She is careless.
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单项选择题
Many commercials begin with a cheerful song of some kind because______.
A．pop songs attract viewer attention
B．it can increase their loudness
C．advertisers want to make them sound different from regular programs
D．unlike regular programs their intensity of sound varies over a wide range
单项选择题
The huge increase in world production and population ____________.
A．has made the world a worse place to live in
B．has had a positive influence on the environment
C．has not significantly affected the environment
D．has made the world a dangerous place to live in
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