Studies confirm that （）aerobic activity at least three days a week promotes sound sleep. ( 章节：2 难度：3)
- A、flip
- B、moderate
- C、shiver
- D、counter
正确答案:B
答案解析:有
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Studies confirm that （）aerobic activity at least three days a week promotes sound sleep. ( 章节：2 难度：3)
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