The largest earthquake （magnitude 里氏 9．5） of the 20th century happened on May 22,1960 off the coast of South Central Chile．
It generated（生成） one of the most destructive Pacific-wide tsunamis（海啸）．Near the generating area, both the earthquake and the tsunami were very much destructive, particularly in the coastal area from Concepcion to the south end of Isia Chiloe．The largest tsunami damage occurred at Isia Chiloe—the coastal area closest to the epicenter（震中）．Huge tsunami waves measuring as high as 25 meters arrived within 10 to 15 minutes after the earthquake, killing at least two hundred people, sinking all the boats, and flooding half a kilometer inland．
There was large damage and loss of life at Concepcion, Chile's top industrial city．Near the city of Valdivia, the earthquake and following aftershocks generated landslides which killed 18 people．At me port city of Valparaiso, a city of 200,000, many buildings collapsed．A total of 130,000 houses were destroyed —one in every three in the earthquake zone and nearly 2,000,000 people were left homeless．
Total damage losses, including to agriculture and to industry, were estimated to be over a half billion dollars ．The total number of death related with both the tsunami and the earthquake was never found accurately for the region Estimates of deaths reached between 490 to 5,7002 with no distinction（差别） as to how many deaths were caused by the earthquake and how many were caused by the tsunami．However, it is believed that most of the deaths in Chile were caused by the tsunami．
68．Where did the largest tsunami damage occurred?
A．Concepcion B．Isia Chiloe C．Valdivia D．Valparaiso
69．What can we learn about the tsunami waves generated by the earthquake?
A．The tsunami waves as high as 25 meters arrived immediately after the earthquake．
B．The tsunami waves killed 200 people and sank all boats．
C．The tsunami waves were very destructive．
D．The tsunami waves flooded half of the inland．
70．What is generally thought the main cause of deaths in Chiloe?
A．landslides B．the tsunami
C．aftershocks D．the magnitude 9．5 earthquake
71．What does the underlined word "collapsed" probably mean ?
A．was destroyed B．caught fire
C．was flooded D．sank