2. 外语
  3. People whose jobs require them to sit for long periods of time suffer as much from back pain as people who lift all day long.

People whose jobs require them to sit for long periods of time suffer as much from back pain as people who lift all day long.

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问题     People whose jobs require them to sit for long periods of time suffer as much from back pain as people who lift all day long.
    Many researchers believe that the huge increase in back pain over the past couple of【B1】______ has a lot to do with the fact that more and more of us are spending our work days in chairs.
    Many people have the【B2】______ that if their back pain becomes very severe, they can always 【B3】______surgery. Nothing could be further from the truth. The amount of pain someone suffers from has very little to do with whether or not he or she could【B4】______surgery. One British researcher has estimated that for every 10,000 people who experience back pain, only four need surgery. And yet, one of the most【B5】______ asked questions that back pain sufferers ask is: "Who’s the best specialist in town?" Waste of time. Physicians today【B6】______physical activity and the use of posture(姿势)support clothes to【B7】______ exercise while supporting back muscles.
    Not many years ago, back pain patients were put to bed, sometimes for weeks or months. Two or three days of bed rest is now the【B8】______. Physically speaking, if you stay in bed, your muscle strength can decline by as much as three percent per day. At that rate, you will end up with no more energy left to【B9】______ normal daily routines.
    A lot of attention has recently been paid to【B10】______ links between depression and back pain. It is not rare.
【B8】
选项
答案norm
解析 空格前的定冠词the表明此处应填入名词，作句子的表语。norm“标准。规范”。
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