Anewphoneappusesvibrations(振动)fromsmartphonestoalertpeo...

问题详情：

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 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.

Smart phones are equipped with accelerometers. They measure acceleration movement of earth. Like that of a car of 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 also are used in global positioning system apps, also called GPS.

MyShake uses phone accelerometers to measure seismic(地震的) activity. It has been programmed to know the difference between normal activity and earthquake movement. The software developers say their app right 93 percent of the time.

A smart phone sends seismic information to the app developers. If the developers receive several notifications from one area, it recognizes that an earthquake may be taking place or will take place soon. Using information sent from the app, the network then estimates the location and strength of the quake in real time. MyShake can record magnitude(震级) 5.0 earthquakes at distances of 10 kilometers of less. MyShake uses very little power, according to its developers. Only when seismic activity is sensed by the app does it become active and sends data to the network.

MyShake can add to information collected by the U.S Geological Survey. That U.S agency has created the Earthquake Early Warning System, also known as the EEW. The EEW has deployed(安置) sensors for measuring quakes in many areas . In places where no such equipment exists, MyShake may be the only method of early quake detection. “Our goal is to build a worldwide seismic network and use the data to reduce the effects of earthquakes on us as individuals and on society as a whole,” say the researchers. The developers say they hope to add a feature that would warn people about a possible tsunami, or the huge waves after an earthquake.

33. Which of the following is a function of accelerometers?

A. Positioning the location of a car of airplane.

B. Measuring speedup movement of earth.

C. Keeping track of smart phones.

D. Creating a worldwide warning system.

34. According to the text, MyShake can              .

A. add to information collected by the U.S. Geological Survey

B. record magnitude 5.0 earthquakes at distances of 10 km or more

C. be the only method of early quake detection

D. use phone accelerometers to prevent seismic activity

35. What does the passage mainly talk about?

A. An instrument to warn people about tsunami.

B. A smart phone to measure the movement of earth.

C. A phone app to warn people about earthquakes.

D. A phone app to reduce the effects of earthquakes.

【回答】

BAC

知识点：科普环保类阅读

题型：阅读理解