C．Marathon runners are least likely to die.

　　D．Proper exercise contributes to good health.

　　答案：D　推理判断题。根据最后一段可知答案为D项。

　　Ⅱ.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.

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