单项选择题

The writer's attitude towards laughter is

A．critical.
B．doubtful,
C．positive.
D．negative.
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单项选择题
Doctors have found that laughter
A．keeps down blood pressure.
B．has similar effects to physical exercise.
C．decreases the heart rate.
D．increases stress.
单项选择题
Campbell believes people should pay more attention to health promotion and disease prevention because most of these diseases
A．can hardly be cured.
B．can be cured gradually.
C．can cause many deaths.
D．can be cured only by specialists.
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