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  3. Can earthquake be predicted? Scientists are (1)_____ programs to predict where and when an earthquake will occur. They hope to (

Can earthquake be predicted? Scientists are (1)_____ programs to predict where and when an earthquake will occur. They hope to (

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问题     Can earthquake be predicted? Scientists are (1)_____ programs to predict where and when an earthquake will occur. They hope to (2)_____ an early warning system that can be used to (3)_____ earth-quakes so that lives can be saved. The scientists who are (4)_____ this work is called seismologists. The word seismologist is (5)_____ from the Greek word seismos, meaning earthquake.
    Earthquakes are the most dangerous and (6)_____ of all natural events. They occur in many parts of the world. Giant earthquakes have been (7)_____ in Iran, China, India, Alaska, and so on. Two of the biggest earthquakes that were ever recorded (8)_____ in China and Alaska, which measured about 8.5 on the Richter Scale. The Richter Scale was (9)_____ by Charles Richter in 1935, and compares the energy (10)_____ of earthquakes. An earthquake that measures a 2 on the scale can be felt but causes (11)_____ damage. One that measures 4.5 on the scale can cause slight damage, and an earth-quake that has a reading of over 7 can cause (12)_____ damage. It is important to note that a reading of 4 indicates a quake ten times as strong as one with a reading of 3. How do earthquakes occur? Earthquakes are caused by the shifting of rocks along cracks, or faults, in the earth’s crust. The (13)_____ is produced when rocks near each other are pulled (14)_____ different directions.
    Earthquake (15)_____ is in its infancy. Scientists have only a (16)_____ understanding of the physical (17)_____ that cause earthquakes. Much more research has to be done. New and more up-to-date (18)_____ have to be found for collecting earthquake data and analyzing it. (19)_____, seismologists have had some success in predicting earthquakes. Several small earthquakes were predicted. While this is a small start, it is (20)_____ a beginning.

选项 A、develop
B、produce
C、learn
D、discover
答案A
解析 语义衔接题。上一句提到：科学家们在研究能够预测地震何时何地发生的程序，本句是对上句做出进一步解释：他们希望开发一个早期预警系统，可以用来预测地震，这样就可以避免伤亡。句中develop an early warning system与上句中的work on programs属于同一语境，前者是对后者的进一步解释说明，develop在句中指"开发"。produce意为"生产，制作"，虽然produce an early warning system也说得通，但develop an early warning system与前一句中的work on programs语义联系更为紧密，将科学家们兢兢业业，努力进行研究的过程表现出来，故develop比produce更适合；learn意为"学习"，这与前句"研究开发程序"意思不一致，故排除；discover意为"发现"，discover an early warning system表示"这个系统已经存在，只不过没被发现而已"，这与前句"致力于研究程序"意思相悖。
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