Most earthquakes occur within the upper 15 miles of the earth’s surface. But

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问题 Most earthquakes occur within the upper 15 miles of the earth’s surface. But earthquakes can and do occur【C1】______all depths to about 460 miles. Their number【C2】______as the depth increases. At about 460 miles one earthquake occurs only every few years. Near the surface earthquakes may run as【C3】______as 100 in a month, but the yearly average does not【C4】______much.
The【C5】______of the disaster in an earthquake depends on many【C6】______. If you carefully build a toy house with an erect set, it will still stand no matter【C7】______you shake the table. But if you build a toy house with a【C8】______of cards, a slight shake of the table will make it fall. An earthquake in Agadir, Morocco, was not strong enough to【C9】______on distant instruments, but it completely destroyed the city. Many stronger earthquakes have done comparatively【C10】______damage. If a building is well【C11】______and built on solid ground, it will【C12】______an earthquake. Most【C13】______in earthquakes have been【C14】______faulty building construction or poor building sites. A third and very serious factor is panic. When people rush out into narrow streets, more deaths will【C15】______.
The United Nations【C16】______an important part in【C17】______the damage done by earthquakes. It has sent a team of experts to all countries known to be【C18】______by earthquakes. Working with local geologists and engineers, the experts have studied the【C19】______of the ground and the type of most practical building code for the local area. If【C20】______, these suggestions will make disastrous earthquakes almost a thing of the past. [br] 【C4】

选项 A、change
B、alter
C、differ
D、vary

答案 D

解析词义辨析题change，alter，vary都含“改变”的意思。change指“使改变得与原物完全不同”或“使发生以新代旧的变化”，如：The appearance of the town is quitechanged．这个城镇的外观变化颇大。alter指“局部的、外表的变化，但特点不变”，如：This coat should be altered．这件外套应该改改。vary指“不规则或连续地改变”，如：Customs vary with the times．习俗随时代而异。differ(from sb．／sth．)“(与某人f某事物])不同，不一样，有区别”。此处讲的是每年地震的平均数量，是指连续性的波动，故选D。

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