Any activity that requires too much ( ), such as reading a novel or a long article, demands your focus, so you slow down physically. ( 章节：4 难度：2)
- A、statistics
- B、atmosphere
- C、concentration
- D、supplement
正确答案:C
答案解析:有
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Any activity that requires too much ( ), such as reading a novel or a long article, demands your focus, so you slow down physically. ( 章节：4 难度：2)
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