--- 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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--- 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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