4. In order to limit the damage and to prevent some of the suffering resulting from earthquakes, scientists are working on ways to enable accurate prediction. Special instruments are used to help people record, for example, shaking of the earth. Scientists are trying to find methods that will enable them to indicate the exact time, location and size of an earthquake.

　　5. Certain phenomena have been observed which are believed to be signs of imminent earthquakes. These include strange behaviors of some animals, the changes in the content of mineral water, etc. The magnetic properties of rocks may also display special, pattern before major earthquakes happen.

　　23. Paragraph 2

　　24. Paragraph 3

　　25. Paragraph 4

　　26. Paragraph 5

　　A. Earthquake forecast

　　B. Historical records of earthquakes

　　C. Intensities of earthquakes

　　D. Cause of earthquakes

　　E. Indications of earthquakes

　　F. Damaging earthquakes

　　27. Not all damage during an earthquake is caused

　　28. Not all earthquakes are strong enough

　　29. Scientists have been working hard to warn people

　　30. Earthquakes can be predicted by observing

　　A. by the quake itself

　　B. not be prevented

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