- Could you tell me why I am constantly yawning this afternoon?-Yawning ______ an indication that your body lacks oxygen and needs a rest. [ ]A. acts asB. se-高中英语-n多题

◎ 题干

- Could you tell me why I am constantly yawning this afternoon?
-Yawning ______ an indication that your body lacks oxygen and needs a rest.

[ ]

A. acts as
B. serves as
C. functions as
D. plays as

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◎ 解析

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◎ 知识点

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