问题
选择题
Nokia has a family of low-cost mobile phones based on Google's Android operating system.
A．performed
B．operated
C．launched
D．instructed
答案
C
题目分析：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。