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  3. Earthquake is a shaking of the ground caused by the sudden breaking and the shifting of large sections of the earth’s rocky oute

Earthquake is a shaking of the ground caused by the sudden breaking and the shifting of large sections of the earth’s rocky oute

admin2012-09-11  47
问题     Earthquake is a shaking of the ground caused by the sudden breaking and the shifting of large sections of the earth’s rocky outer shell. Earthquakes are among the most powerful events on earth, and their results can be terrifying. A severe earthquake may release energy 10,000 times as great as that of the first atomic bomb. Rock movements during an earthquake can make rivers change their courses. Earthquakes can trigger landslides that cause great damage and loss of life. Large earthquakes beneath the ocean can create a series of huge, destructive waves called tsunamis that flood coasts for many miles.
    Earthquakes almost never kill people directly. Instead, many deaths and injuries in earthquakes result from falling objects and the collapse of buildings, bridges, and other structures. Fire resulting from broken gas or power lines is another major danger during a quake. Spills of hazardous chemicals are also a concern during an earthquake.
    The force of an earthquake depends on how much rock breaks and how far it shifts. Powerful earthquakes can shake firm ground violently for great distances. During minor earthquakes, the vibration may be no greater than the vibration caused by a passing truck.
    On average, a powerful earthquake occurs less than once every two years. At least 40 moderate earthquakes cause damage somewhere in the world each year. About 40,000 to 50,000 small earthquakes—large enough to be felt but not damaging—occur annually.
The passage is mainly about______.
选项 A、earthquakes and their effects
B、the way of earthquakes taking place
C、the classification of earthquakes
D、the damaging results of earthquakes
答案A
解析 本题主要考查考生对文章整体意思的把握。本文主要介绍了地震产生的原因、强度、释放的能量以及带给人们的影响，故选A。
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