Even if you have an effective detection system, though, it is useless if you cannot evacuate a threatened area. Here, speed is of the essence. Computer modelling can help show which areas are likely to be safest, but common sense is often the best guiderun like the wind, away from the sea. Evacuation warnings, too, should be easy to give as long as people are awake. Radios are ubiquitous, even in most poor places. It is just a matter of having systems in place to tell the radio stations to tell people to run. The problem was that no one did.
21. An important question raised after the Tsunami is that .
A) how to help those helpless people
B) how to detect the happening of tsunami
C) how to predict tsunamigenic earthquakes
D) how people should be cautiously warned
22. To the forecasters, the troublesome problem is .
A) it’s hard to tell disastrous submarine earthquake
B) people don’t take much notice of their warning
C) tsunamis are rare
D) where to get money for the false alarms
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 South
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