分析 本文主要介绍了关于地震的一些知识,包括其形成的原因,所造成的危害及每年发生的频率等.
解答 46.A.词义猜测题.根据文中 Generally,a powerful earthquake occurs less than once every two years.可知每两年一场强大的地震发生不到一次,其中occur表示发生.其次也可将三个选项汉语意思代入句中进行判断,故选择A.
47.B.细节理解题.根据文中We all know that a strong earthquake attacked Japan on March 11th,2011.A number of people died in the natural disaster.可知2011年日本发生了强地震,许多人在这场自然灾害中丧生了,则地震是一种自然灾害,故选择B.其次本题也可根据常识直接进行选择.
48.B.细节理解题.根据文中An earthquake is a shaking of the ground caused by the sudden breaking of large parts of Earth's rocky outer shell(壳) and the sudden moving of Earth's rocky outer shell in opposite directions.可知地震是地表的一种振动,由大部分地球岩石外壳突然断裂和地球岩石外壳突然移动在相反方向作用下而引起的.本题解题关键是opposite directions(相反方向),仔细观察三个选项只有B项是相反方向,故选择B.
49.C.细节理解题.根据文中About 40,000 to 50,000 small earthquakes----large enough to be felt but not damaging----occur every year.可知每年有大约4万到5万小型地震发生,而不是C选项中的大约4千到5千,故选择C.
50.B.主旨大意题.文中主要介绍了关于地震的一些知识,包括其形成原因,所造成的危害及每年发生的频率等,故选择B.
点评 本文是一篇科普说明文,主要介绍了关于地震的一些知识.做题时应认真阅读,理解大意,准确定位信息,在文中找到相对应的答案或者依据,并仔细观察选项即可作出选择,难度适中.
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