【題目】It’s necessary for the phubbers(低頭族)to______the time they spend on their smart phones.

A. cut off B. cut in C. cut down D. cut up

【答案】C

【解析】句意：對于“低頭族”來講，減少花在智能機上的時間有必要。A. cut off切除；B. cut in插嘴，干預(yù)；C. cut down減少，砍倒；D. cut up切。人們應(yīng)該少用智能機，減少花在其上的時間。故選C。

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