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    Remove the batteries when they become weak or when the unit is not in use for extended periods. This will           damage to the unit from battery leakage at such times.   
    A．disappointB．concernC．instructD．prevent
    D
    词义辨析。    A. 使失望  B. 涉及；使担心   C.指导 D.预防；阻止。句意：……此时此刻，这将阻止电池漏液对这个装置的毁坏。故选D。
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