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__.
【2017届高考英语一轮复习单元演练:必修3 Module 3《The Violence of Nature》(第2课时)(外研版含答案)】相关文章:
★ 【北师大版】2014届高考英语一轮复习指导课时作业:Unit 6 B卷 Word版含解析
★ 【优化方案】2017届高考英语二轮复习全国卷Ⅱ题型重组训练:第4组(含解析)
★ 【人教版】2014届高考英语一轮复习指导考点针对练:必修2 unit1《Cultural relics》
★ 2014届高考英语一轮复习课时作业(十五)必修3Module 3《The Violence of Nature》(外研版)
★ 2017届高考英语一轮复习单元演练:必修3 Module 3《The Violence of Nature》(第1课时)(外研版含答案)
★ 四川省2016届高考英语一轮复习课时作业(40) Module 4 Music Born in America 外研版选修8
★ 【优化方案】2017届高考英语二轮复习全国卷Ⅱ题型重组训练:第6组(含解析)
★ 四川省2016届高考英语一轮复习课时作业(45) Module 3 Foreign Food 外研版选修8
★ 2014届高考英语一轮复习课时作业(四)必修1Module 4《A Social Survey—My Neighbourhood》(外研版)
最新
2017-04-24
2017-04-24
2017-04-24
2017-04-24
2017-04-21
2017-04-21