单项选择题

What kind of benefits has been or will be brought to us as a result of the researches

A．Calorie restriction.
B．Apoptosis.
C．Cardiovascular disease.
D．Cancer prevention.
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单项选择题
The result of the researches so far may help, as asserted by one of the researchers, ______
A．to prevent cardiovascular disease and cancer
B．to understand the processes that lead to cell death
C．to improve our memories
D．to do what we think is right
单项选择题
Driving straight ahead, and you will see a ______ to the New Expressway.
A．signal
B．mark
C．sign
D．board
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