单项选择题

Smoking is so harmful to personal health that it kills ______ people each year than automobile accidents.

A．even more times
B．seven times more
C．over seven times
D．seven times
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单项选择题
After the new technique was introduced, the factory produced ______ tractors in 1988 as the year before.
A．as twice many
B．as many twice
C．twice as many
D．twice many as
单项选择题
The chief reason for the population growth isn t so much a rise in birth rates ______ a fail in death rates as a result of improvements in medical care.
A．and
B．as
C．but
D．or
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