Used ______, the battery can last 72 hou...

Used ______, the battery can last 72 hours.

A. artificially B. properly

C. scarcely D. instantly

B 【解析】考查副词词义辨析。句意：使用得当，电池可以持续72小时。A. artificially人工地；B. properly恰当地；C. scarcely几乎不；D. instantly立即地。故选B。

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