Ⅲ.完形填空

　　As scientists learn more about the causes of earthquakes, they become better able to predict them. First of all, they know that quakes are__1__to occur in areas where the tectonic(地壳构造的)plates push__2__each other. They__3__these areas closely, using different instruments. They__4__the vibrations(震动)of the earth with seismographs(地震仪), which__5__on rolls of paper all movements, both large and small. Scientists usually use the Richter scale(里氏震级)，__6__after a famous seismologist, for these measurements. When an earthquake measures over 4.5 on the Richter scale, it is__7__enough to cause damage. Scientists have determined that a(an)__8__is not likely to have a large__9__when many small quakes have been__10__. When the small quakes stop, then pressure__11__and a strong quake is more likely.

　　There are several other__12__to predict earthquakes. Scientists can measure the tiny__13__in the tilt(倾斜)of the land that happen before an earthquake occurs. Increases in the amount of radon(氡), a substance found in deep__14__， as well as a high level of water in the wells, can also__15__that an earthquake is likely to occur. In addition, scientists have found that some animals, like dogs, behave__16__before an earthquake: they become__17__and howl.

　　Seismologists have__18__predicted several earthquakes, such as the earthquake which occurred in Zhangjiakou, China in 1998. __19__， not all earthquakes are predictable, and a system for predicting is not yet__20__.

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