单项选择题

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

A．seven more times
B．seven times more
C．over seven times
D．seven times
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______ can be seen from the comparison of these figures, the principle involves the active participation of the patient in the modification of his condition.
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This is an exciting area of study, and one ______ which new applications are being discovered almost daily.
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