A.a necessity B.an emergency C.a number of new headaches D.family arguments E.big and light palm-sized models

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问题    A.a necessity
   B.an emergency
   C.a number of new headaches
   D.family arguments
   E.big and light palm-sized models
   F.countless new facilities  
Cell phones are common in our lives and have become______.

选项

答案A

解析 文章第二段介绍了手机在日常生活中的普遍性和发挥的重要作用,指出手机已经成了一个必需的工具。故选A。
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