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

A. cut outB. cut off

C. cut downD. cut up

【答案】C

【解析】

句意：對低頭族來說，減少花在智能手機上的時間是有必要的。首先明確選項中動詞短語的意思，A.插入；B.切斷；C.縮減；D.切碎。 根據(jù)語境推測句意是"對低頭族來說，減少花在智能手機上的時間是有必要的．"，由此判斷句子中缺少短語，cut down，故選C。

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