Actually，there are several million small earthquakes every year.Large earthquakes such as the 1964 Alaskan quake that measured 9.2 on the Richter scale，can cause millions of dollars in damage.In the last 500 years，millions of people have been killed by earthquakes around the world—including 240，000 in the 1976 Tangshan earthquake in China.

　　A 60-second or less earthquake can cause devastation （破坏） that continues for years after the first tremor （震动）.In 1972，a series of severe earthquakes struck Managua，Nicaragua.Fifteen years later，the city still looked the way it had a week after the earthquake hit，because the country did not have the money necessary to rebuild it.

　　The shaking of the earth is sometimes not the greatest disaster.It is in the ensuing fires and floods that often the greatest damage occurs.In the 1906 earthquake，it was the fires caused after it that did the majority of the damage.An earthquake can also destroy dams high above a city or valleys，causing floods to sweep down and sweep away everything in their path.

　　9.Which of the following is the main idea of Paragraph 1?

　　A.An earthquake comes from inside the earth.

　　B.The earth has great energy in storage.

　　C.How the earth plates move.

　　D.How an earthquake happens.

　　10.How many examples are used in the passage to show the damage and destruction earthquakes cause?

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