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  
We can use cell phones to communicate with othors when we encounter______.

选项

答案B

解析 第三段第二句提到we can use cell phones to let our family know we’ll be 1ate or if there’s a sudden change of plan or an emergency.(我们可以用手机通知家人我们可能迟到,或是如果有突然的计划变更或紧急情况。)故选B。
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