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Nokia has    a family    of low-cost mobile phones based on Google's Android operating system.
A.performedB.operatedC.launchedD.instructed
C

试题分析:句意:Nokia根据谷歌的Android 操作系统发动实施了一系列的低成本移动电话。A. performed 表现;B. operated运作;C. launched发射、实施;D. instructed指导。故选C。
考点: 考查动词的用法。 
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