分析 本文主要介紹了關(guān)于地震的一些知識,包括其形成的原因,所造成的危害及每年發(fā)生的頻率等.
解答 46.A.詞義猜測題.根據(jù)文中 Generally,a powerful earthquake occurs less than once every two years.可知每兩年一場強大的地震發(fā)生不到一次,其中occur表示發(fā)生.其次也可將三個選項漢語意思代入句中進行判斷,故選擇A.
47.B.細節(jié)理解題.根據(jù)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年日本發(fā)生了強地震,許多人在這場自然災(zāi)害中喪生了,則地震是一種自然災(zāi)害,故選擇B.其次本題也可根據(jù)常識直接進行選擇.
48.B.細節(jié)理解題.根據(jù)文中An earthquake is a shaking of the ground caused by the sudden breaking of large parts of Earth's rocky outer shell(殼) and the sudden moving of Earth's rocky outer shell in opposite directions.可知地震是地表的一種振動,由大部分地球巖石外殼突然斷裂和地球巖石外殼突然移動在相反方向作用下而引起的.本題解題關(guān)鍵是opposite directions(相反方向),仔細觀察三個選項只有B項是相反方向,故選擇B.
49.C.細節(jié)理解題.根據(jù)文中About 40,000 to 50,000 small earthquakes----large enough to be felt but not damaging----occur every year.可知每年有大約4萬到5萬小型地震發(fā)生,而不是C選項中的大約4千到5千,故選擇C.
50.B.主旨大意題.文中主要介紹了關(guān)于地震的一些知識,包括其形成原因,所造成的危害及每年發(fā)生的頻率等,故選擇B.
點評 本文是一篇科普說明文,主要介紹了關(guān)于地震的一些知識.做題時應(yīng)認真閱讀,理解大意,準確定位信息,在文中找到相對應(yīng)的答案或者依據(jù),并仔細觀察選項即可作出選擇,難度適中.
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