北京市海淀区2017届九年级上学期英语期中复习（8）D 篇练习10篇

D—1 Imagine you’re at a party full of strangers. You’re nervous. Who are these people? How do you start a conversation? Luckily, you’ve got a thing that sends out energy at small chips（芯片） in everyone’s name tag（标签）.The chips send back name, job, hobbies－whatever. Making new friends becomes simple. This hasn’t quite happened in real life. But the world is already experiencing a new age of using RFID technology. An RFID tag with a small chip can be fixed in a product, under your pet’s skin（皮肤）, even under your own skin. Some RFID tags have no energy source because they do not need it. The energy comes from a scanning device（扫描装置）, which sends out energy and starts up the tag immediately. Such a tag carries information to that object, and the information can be renewed. Already, RFID technology is used for recognizing（识别） each car or truck on the road and it might appear in your passport. Doctors may put a small chip under the skin to get a patient’s medical records. At a nightclub in Pa