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7月19日托福考题回忆|很多旧题重现!
- 部分动物会在每年固定时间冬眠,即便此时天气尚未变冷、食物也未短缺。这是因为它们体内有生物钟,会在特定时间发出冬眠信号。例如北极地松鼠,每年初夏会大量进食使体重翻倍,夏末便进入冬眠,即便当时仍有充足食物。
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