单项选择题

Experts used to believe that the chief reason for global wanning is _________.

A．that most fuel is consumed in the northern hemisphere
B．human activities
C．natural influences and carbon dioxide
D．the solar energy
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单项选择题
What Dr. Goldspink says to men is that _________.
A．men can't recover lost heart function in any way
B．men can recover lost heart function at any age
C．proper exercise does good to the heart at any age
D．it's too late to start exercise when men are getting old
单项选择题
The best title of the passage is _________.
A．Exercise and the Health of Heart
B．The Difference between Men and Women
C．Heart and Health
D．Why Do Women Live Longer than Men
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