2. 外语
  3. If the contagious nature of yawning is a means of communication within groups of animals, possibly as a means to______behavior,

If the contagious nature of yawning is a means of communication within groups of animals, possibly as a means to______behavior,

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问题 If the contagious nature of yawning is a means of communication within groups of animals, possibly as a means to______behavior, yawning in humans is most likely ______and an evolutionarily ancient mechanism that has lost its significance.
选项 A、clarify… substantial
B、mirror… minimal
C、synchronize … vestigial
D、temporize… analogous
E、interrupt… pernicious
答案C
解析
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