An earthquake shakes the ground with two kinds of waves. The new system uses information from a low­energy wave that moves quickly but causes little damage. Experts call this the P­wave.The slower but stronger S­wave is the main threat to life and property. Japan has a system based on P­waves. There，the warnings are used to slow down high­speed bullet trains.Other countries have warning systems that measure S­waves.

　　The new system is designed to estimate the strength of the earthquake once the shaking starts. Areas directly above the center of the earthquake would have the least warning. Distant places might have as long as forty seconds.

　　The scientists are still testing their proposed system in the Los Angeles area. Professor Allen notes that an early warning system for earthquakes would require a major campaign of public education.

　　【解题导语】 美国的科学家开发了一种新的计算机程序，该程序可在大型地震来临前提供预警。

　　1．Which of the following is TRUE about the new earthquake warning system?

　　A．It can give people enough time to run away from earthquakes.

　　B．It can give people seconds to take immediate measures.

　　C．It is developed in Japan.

　　D．It is a system based on S­waves.

　　答案　B　[细节理解题。由第一段最后一句可知选B。]

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