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    【题目】5G smart phones are believed to work 9 and 20 times faster than previous______________.

    A.onesB.thoseC.themD.that

    【答案】A

    【解析】

    考查代词词义辨析。句意：据认为，5G智能手机的运行速度比之前的手机快了9到20倍。A. ones泛指前面的可数名词复数；B. those那些，特指前面提到的可数名词复数；C. them他们，指代前面的可数名词复数；D. that特指前面提到的单数名词或者不可数名词。根据语境可知，此处泛指以前的smart phones，应使用ones。故选A。

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