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 ______ .
The autho feels ______ about humanity’s final victory in the century-old battle against back-pain.

选项

答案optimistic

解析 参见最后一段:...the good news...embracing bold new ways to think about...
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