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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A．worksB．carriesC．looksD．depends
A．works
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A．ThereforeB．MoreoverC．FurthermoreD．However
A．Therefore
B．Moreover
C．Furthermore
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