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 resort to surgery. Nothing could be【B3】______from the truth. The amount of pain someone【B4】______from has very little to do with whether or not he or she could【B5】______from surgery. One British researcher has【B6】______that for every 10,000 people who experience back pain, only four need surgery. And yet, one of the most frequently asked questions that back pain sufferers ask is: "Who’s the best【B7】______in town?" Waste of time. Physicians today【B8】______physical activity and the use of [posture](姿势)support clothes to promote exercise while supporting back muscles.
【B9】______Two or three days of bed rest is now the norm. Physically speaking,【B10】______.At that rate, you will end up with no more energy left to carry out normal daily routines.【B11】______It is not rare.
【B1】
选项
答案decades
解析 根据空格前的couple of可知此处应填入复数名词，decade“十年”，注意词尾要加s。
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