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Most earthquakes occur within the upper 15 miles of the earth’s surface. But
Most earthquakes occur within the upper 15 miles of the earth’s surface. But
游客
2023-12-30
33
管理
问题
Most earthquakes occur within the upper 15 miles of the earth’s surface. But earthquakes can and do occur at all 【C1】________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 high as 100 times in a month, but the【C3】________average does not vary much.
【C4】________comparison with the total number of earthquakes each year, the number of 【C5】________earthquakes is very small.
The【C6】________of the disaster in an earthquake【C7】________on many factors. If you carefully build a toy house with an erector set, it will still stand no matter【C8】________much you shake the table. But if you build a toy house with a pack of cards, a slight【C9】________of the table will make it fall. An earthquake in Agadir, Morocco was not strong enough to be recorded on distant instruments, but it completely【C10】________the city. Many stronger earthquakes have done【C11】________little damage. If a building is well-constructed and built on【C12】________ground, it will resist an earthquake. Most deaths in earthquakes have been due to【C13】________building construction or poor building【C14】________A third and very serious factor is【C15】________When people rush out into narrow streets, more deaths will【C16】________The United Nations has played an important part in【C17】________the damage done by earthquakes. It has sent a team of experts to all countries known to be affected by earthquakes. Working with local geologists and engineers, the experts have studied the【C18】________of the ground and the type of most practical building code for the local area. If【C19】________, these suggestions will make disastrous earthquakes【C20】________a thing of the past. [br] 【C3】
选项
A、yearly
B、daily
C、weekly
D、total
答案
A
解析
句意:在地表附近地震活动的频率高达每月100次,但________的平均值相差不远。结合常识可知,地震发生频率的测量不可能用每天或每周来衡量,与“每月的”相对应的应该是yearly(每年的),故选A。
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