D) Scientists can successfully predict earthquakes.

　　17. A) There were fatal mistakes in its design.

　　B) The builder didnt observe the building codes of the time.

　　C) The traffic load went beyond its capacity.

　　D) It was built according to less strict earthquake-resistance standards.

　　Passage Three

　　Questions 18 to 20 are based on the passage you have just heard.

　　18. A) By judging to what extent they can eliminate the risks.

　　B) By estimating the possible loss of lives and property.

　　C) By estimating the frequency of volcanic eruptions.

　　D) By judging the possible risks against the likely benefits.

　　19. A) One of Etnas recent eruptions made many people move away.

　　B) Etnas frequent eruptions have ruined most of the local farmland.

　　C) Etnas eruptions are frequent but usually mild.

　　D) There are signs that Etna will erupt again in the near future.

　　20. A) They will remain where they are.

　　B) They will leave this area for ever.

　　C) They will turn to experts for advice.

　　D) They will seek shelter in nearby regions.

　　答案：

　　1.A 2.D 3.B 4.C 5.Br6.A 7.B 8.D 9.C 10.Br11.C 12.A 13.B 14.C 15.Br16.C 17.D 18.D 19.C 20.A

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