(76) Earthquake is a shaking of the ground caused by the sudden breaking and

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问题 (76) 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.
(77) 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. [br] It is implied that______.

选项 A、powerful earthquakes usually occur after minor ones
B、modern facilities add to the danger of an earthquake
C、passing trucks are as dangerous as minor earthquakes
D、there is a powerful earthquake occurring every two years

答案 B

解析由第二段可知，地震本身并不是导致人们死亡和受伤的直接原因，而是由于倒塌的建筑以及它们之间的互相碰撞所造成的。而其他的诸如火灾等灾难也是因泄漏气体等原因造成的，而这些都是现代化的设施所导致的。故选B。

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