单项选择题

The passage is mainly about ______.

A．the high injury rates for those doing exercises
B．the ways to avoid exercise injuries
C．the evidences for the seriousness of exercise injuries
D．the studies about injury rates and causes for injuries

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单项选择题

Which of the following is NOT shown as the factor for causing exercise injuries

A．The amount of exercise.
B．The age, sex and body type.
C．Structural abnormalities.
D．The sudden increases in training intensity.

单项选择题

What is the writer's attitude towards high injury rates among adult exercisers reported by the mass media

A．Positive.
B．Indifferent.
C．Negative.
D．Reserved.