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  3. What accounts for the increasing number of back pain sufferers in modern life is a number of factors such as overweight, lack of

What accounts for the increasing number of back pain sufferers in modern life is a number of factors such as overweight, lack of

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问题 What accounts for the increasing number of back pain sufferers in modern life is a number of factors such as overweight, lack of exercise and ______ .
What’s so mysterious about back problems?
选项 A、The impossibility to measure the intensity of the pain.
B、The unknown origin of the pain.
C、The disconnect between spine defects and pain.
D、The low percentage of people with abnormal discs among the healthy.
答案C
解析 参见“The Great Pain Mystery”部分第一段第四句：What’s most mysterious about back problems is the frequent disconnection between anatomical defects and pain．
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