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.
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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.
单项选择题
The true injury rates are obtained from
A．the average number of injuries for each individual
B．the amount of exercises for each individual
C．the numbers of the injured and all individuals in training
D．the numbers of people doing exercises and those stopped exercises for one week
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