2. 外语
  3. 　　Most smart phones allow you to run location-sharing software that uses the phone’s GPS capability to let friends and family kn

　　Most smart phones allow you to run location-sharing software that uses the phone’s GPS capability to let friends and family kn

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问题 　　Most smart phones allow you to run location-sharing software that uses the phone’s GPS capability to let friends and family know your exact location. There are lots of great uses for this technology.【B1】________So make sure you’re permitted to use an app or service,  and pay attention to how you are using it. Here’re some important points you may find helpful.
　　Choose what’s best for you. Some location-sharing services are games that let you give a shout-out when you’ve turned up at a particular spot. 【B2】________Still others continue to share your location until you change the setting. Be sure you know exactly how your service shares your location.
　　Know who your friends are. 【B3】________This means people can search to see if you’re online and add you as a friend. It’s important to remember that sharing your location with people you’ve never met in real life is risky, so you should carefully manage friend requests and share your location only with people you know and trust.
　　【B4】________Some services automatically stop sending your location after a period of time,  but others will send it forever—until you stop it. Review your contact list periodically and delete anyone to whom you no longer feel comfortable revealing your location.
　　Update parents. Location-based services are a great way for teens to let parents know where they are without having to call or text.【B5】________If you’re heading home late at night, you can also use a service like Glympse to share your location as you drive, so they will know if you have car trouble or get stuck in traffic.
　　[A] Check back often.
　　[B] Keep sending your location.
　　[C] However, these services are not for all children.
　　[D] With its help, you can easily share your location with them.
　　[E] Check-ins ease worries so they don’t have to follow your every move.
　　[F] Others show where you are all the time or for a period of time you set.
　　[G] Some location services operate like Facebook, where you invite and accept friends.
【B3】
选项
答案G
解析 后文提到这可以实现人们根据是否在线添加好友，并提醒人们谨慎添加好友，所以此处应是介绍位置服务有添加好友的功能，故选G。
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