2. 外语
  3. Millions of people in the United States suffer from ______ back pain that comes from sitting too long at a desk.

Millions of people in the United States suffer from ______ back pain that comes from sitting too long at a desk.

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问题 Millions of people in the United States suffer from ______ back pain that comes from sitting too long at a desk.
选项 A、chronic
B、casual
C、catastrophic
D、elastic
答案A
解析 A项的“chronic慢性的，长期的”符合题意，如：chronic colitis(慢性结肠炎)。其他三项“B项casual偶然的，临时的；C项catastrophic悲惨的，灾难的；D项elastic弹性的”都不正确。本题空格处是忍受长期的背痛。因此A项为正确答案。
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