Camels have three eyelids to ________ themselves from the blowing sand.

A．protect B．stop C．keep D．hide

 

A

【解析】A　考查動詞。根據(jù)句意，駱駝有三個眼瞼，以防止風沙進入眼睛。用protect“保護”，意在突出生理器官的功能。

 

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