3. 由题干关键词protocals定位至第二个小标题Network Protocols下第一段的第五句和第六句Between generation two and three, network engineers created protocols that are more advanced than generation twos digital technology but not so innovative that they are a truly new generation. Developers refer to these protocols as generation 2. 5.意思是说在第二和第三代智能手机之间,网络工程师们研制出比第二代数字技术更为先进的网络规程,但这套规程还不够创新成为第三代手机,开发商把这套规程成为第2.5代,因此答案A)与原文相符。
4. 由题干关键词central services on smartpone定位至第三个小标题Flexible Interfaces下第一段第一句The core services on smartphones all tie in to the idea of a multi-purpose device that can effectively multitask.可知,智能手机的核心服务就是用这种多功能装置使用户能有效地做多件事情,因此答案A)正确。
5. 由题干关键词Bluetooth和wirelessly定位至第三个小标题Flexible Interfaces下第二段第一句Systems supported by smartphones include Bluetooth, a short range, wireless radio service that allows phones to wirelessly link up with each other and with other nearby devices that support it. 智能手机支持的系统包括蓝牙,一种短距离无线传输设备,可以把电话和附近支持蓝牙传输的其他设备无限连接起来。因此答案为B)。
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