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
詞義辨析。    A. 使失望  B. 涉及；使擔(dān)心   C.指導(dǎo) D.預(yù)防；阻止。句意：……此時此刻，這將阻止電池漏液對這個裝置的毀壞。故選D。
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