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  3. Earthquakes can be devastating【1】disasters. The infamous San Francisco earthquake of 1906 caused over $ 200 million worth of dam

Earthquakes can be devastating【1】disasters. The infamous San Francisco earthquake of 1906 caused over $ 200 million worth of dam

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问题     Earthquakes can be devastating【1】disasters. The infamous San Francisco earthquake of 1906 caused over $ 200 million worth of damage,【2】almost 30,000 buildings, and【3】about 450 persons. In Japan, the cities of Tokyo and Yokohama were leveled by the earthquake of 1923 in which more than 140, 000 persons were killed by falling buildings and fires, and over a million people were left【4】— all in 30 seconds.
    Hundreds【5】earthquakes occur every year【6】the world. Fortunately,  【7】are as destructive as those described above. The development of【8】accurate system for predicting earthquakes would【9】the loss of life and【10】, but at present scientists can only study these phenomena. The study of earthquakes is called seismology. Seismographs, instruments sensitive【11】ground movement, are used to chart each motion, and the Richter Scale is commonly used to grade each earthquake’s strength【12】a 1 to 10 scale. It is now known that earthquakes are created by sudden shifts that occur along faults deep in the earth’s crust.【13】to the Theory of Continental Drift, the earth’s crust consists【14】about twenty rigid sections,【15】plates that are in continuous【16】. This movement grinds and presses rock at the edge of the plates.【17】the pressure becomes too great, the rocks shift, and the resulting movement sends energy, or seismic waves, to the【18】of the earth. Most major earthquakes occur along the edge of the【19】, and the most damaging impact occurs at the first surface-point reached【20】the seismic waves.
【C20】
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