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23. Which of the following is true according to the passage?
A) Big waves depend on the intensity of earthquake.
B) Most earthquakes that cause tsunamis happen in the Pacific.
C) Tsunamis often occur along the coast of Indonesia.
D) Trenches at the bottom of the sea create tsunamis.

24. To the countries in Southª²East Asia, building a tsunami monitoring system ______ .
A) is what they can not afford
B) is not a practical solution
C) won¡¯t cost a lot of money
D) is effective but expensive

25. It is implied in the last paragraph that ______ .
A) people should be taught how to escape the tsunami
B) a sound detection system could have saved the disaster
C) radio stations neglected their responsibilities
D) the heavy loss in the Southª²East tsunami could have been less

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