题目内容
（请给出正确答案）
[主观题]
The true injury rates are obtained from ______.A．the average number of injuries for each i
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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