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 chronic慢性的，长期的；casual偶然的，临时的；catastrophic悲惨的，灾难的；elastic弹性的。
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