Unit 2 单元话题阅读理解专项练习-2022-2023学年高二英语选择性必修第一册单元重难点易错题精练（人教版2019）

Unit 2单元话题阅读理解专项练习 (名校最新真题) （2022·四川凉山·高二期末）A new phone app uses vibrations (振动) from smart phones to alert people about earthquakes. The phone app recognizes sudden shaking of the earth’s surface through sensors (传感器) in smart phones. The new app is called MyShake. It is the work of four researchers at the University of California, Berkeley. They said they created a worldwide warning system that would inform people and give them time to prepare. The MyShake app is available only for Android phones. Smart phones are equipped with accelerometers (加速计) . These instruments measure movement, like that of a car or airplane. They can also measure the shaking of a machine, building or other structure. Accelerometers are used in activity trackers and apps that count steps or other exercise. They are also used in global positioning system (GPS) apps. MyShake uses phone accelerometers to measure seismic (地震引起的) activity. It has been programmed to know the difference between normal activity an