题目内容：

A new phone app uses shaking from smartphones to warn people about earthquakes. The new app is called MyShake, which is the work of four researchers at the University of California. Berkeley.

Smartphones are equipped with accelerometers(加速器). 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 is right 93 percent of the time. A smartphone sends seismic information to the app developers. If the developers receive several warnings 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 judges the location and strength of the quake in real time. MyShake can record 5.0 earthquake at distances of 10 kilometers or 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. The app works best when your phone is resting on a flat surface, like a table.

The developers hope that 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 used sensors for measuring quakes in many areas. In places where no such equipment exists, MyShake may be the only method of early quake detection (发现). The app also shows ways to stay safer during an earthquake. The developers say it will become more effective as more people use it.

The developers say they hope to add a feature that will warn people about possible tsunami after an earthquake.

1.The new app

A. is a kind of accelerometer.

B. feels earthquakes through smartphones.

C. is developed by the U.S Geological Survey.

D. predicts possible tsunami after an earthquake.

2.What is the second paragraph mainly talking about?

A. How MyShake works.

B. What seismic activity is.

C. Why MyShake is developed.

D. When accelerometers record earthquake.

3.We can infer that MyShake

A. docs not work when the spartphone is in the pocket

B. sleeps while there is no shaking of the earth’s surface.

C. guides people how to survive when many people use it at the same time.

D. recognizes an earthquake when it receive the information from other sensors.

4.The new app developers hope to

A. use the information by the U.S Geological Survey to better MyShake.

B. unite the U.S Geological Survey to combine the EEW and MyShake.

C. help the EEW detect earthquakes somewhere.

D. improve the EEW.