Earthquake
y year earthquakes are responsible for a large number of deaths and a vast amount of destruction in various parts of the of these damaging earthquakes occur either in a narrow belt which surrounds the Pacific Ocean or in a line which extends from Burma to the Alps in of the destruction is directly caused by the quake example of this is the collapse of buildings as a result of the quake r damage results from landslides or major fires which are initiated by the quake.
e are about a million quakes a unately,however,not all of them are intensity of an earthquake is measured on the Richter Scale,which goes from 0 highest scale recorded to date is r damage generally occurs from quakes ranging upwards from 6.0.
actual cause of the quake itself is the breaking of rocks at or below the earth's is produced by pressure which scientists believe may be due to a number of reasons,two of which are the expansion and contraction of the earth's crust and continental drift.
order to limit the damage and to prevent some of the suffering resulting from earthquakes,scientists are working on ways to enable accurate ial instruments are used to help people record,for example,shaking of the ntists are trying to find methods that will enable them to indicate the exact time,location and size of an earthquake.
ain phenomena have been observed which are believed to be the signs of imminent e include strange behaviors of some animals,the changes in the content of mineral water, magnetic properties of rocks may also display special pattern before major earthquakes happen.
graph 2 __________
graph 3 __________
graph 4 __________
graph 5 __________
hquake's Forecast
orical Records of Earthquakes
nsities o{Earthquakes
e of Earthquakes
cations of Earthquakes
ging Earthquakes
all damage during an earthquake is caused __________.
all earthquakes are strong enough __________.
ntists have been working hard to warn people __________.
hquakes can be predicted by observing __________.
the quake itself
be prevented
cause damage of property and loss of lives
a possible earthquake
unusual behaviors of some animals
strong behaviors of human beings
参考答案：
23.C 本段简述在里氏震级表上反映出来的不同震级。
24.D 本段简述了地震的起因。
26.E 本段介绍了震前可能会出现的.一些异常情况。
27.A 句中的被动语态…is caused提示可能会跟一个by短语。
28.C 形容词加上enough后面常会跟一个动词不定式，文中第二段也讲到有些地震震级不高，不会造成重大破坏和伤亡。
29.D 动词warn后面跟against，或跟of，警告别人将有事情发生。
30.E 动词observin9后面应该有一个宾语，故应选一个名词短语。人类的行为变化跟地震并没有关系，因此F不是正确的选择。
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