UNR is a very ________ engine –– it recharges its own battery while it’s running.

A.flexible              B.permanent           C.delicate              D.efficient 

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從A、B、C、D四個(gè)選項(xiàng)中,找出其劃線(xiàn)部分與所給單詞的劃線(xiàn)部分讀音相同的選項(xiàng)。

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