单项选择题

A．A new fuel for buses.
B．The causes of air pollution.
C．Careers in environmental engineering.
D．A way to improve fuel efficiency in buses.
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单项选择题
A．Sue is a quiet girl now.B．Sue becomes quite talkative.C．Sue has been talkative all the time.D．Sue is used to being talkative.
A．Sue is a quiet girl now.
B．Sue becomes quite talkative.
C．Sue has been talkative all the time.
D．Sue is used to being talkative.
单项选择题
According to the author, the major problem with Germany's tax system is ______.
A．business investment is taxed too heavily
B．the tax rates are high but the tax base is narrow
C．revenues in the form of taxes are not reinvested
D．it encourages individuals or companies to escape taxation
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