大學(xué)英語六級閱讀理解100篇:自然科學(xué)

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　　Icebergs are among nature's most spectacular creations,and yet most people have never seen one.A vague airof mystery envelops them.They come into being-somewhere-in faraway,frigid waters,and thunderous noise and splashing turbulence,which in most cases no one hears or sees. They exist only a short time and then slowly waste away just as unnoticed.

　　Objects of sheerest beauty,they have been called.Appearing in an endless variety of shapes,they may be dazzlingly white,or they may be glassy blue,green,or purple,tinted faintly of darker hues(顏色).They are graceful,stately(宏偉的),inspiring in calm,sunlit seas.

　　But they are also called frightening and dangerous,and that they are-in the night,in the fog,and in storms.Even in clear weather one is wise to stay a safe distance away from them.Most of their bulk is hidden below the water,so their underwater parts may extend out far beyond the visible top.Also,they may roll over unexpectedly,churning(劇烈攪動)the waters around them.

　　Icebergs are parts of glaciers that break off,drift into the water.float about awhile and finally melt.Icebergs afloat today are made of snowflakes that have fallen over long ages of time.They embody snows that drifted down hundred,or many thousand,or in some cases,maybe a million years ago.The snows fell in polar-regions and on cold mountains,where they melted only a little or not at all and so collected to great depthsover the years and centuries.

　　As each year's snow accumulation lay on the surface,evaporation and melting caused the snowflakes slowly to lose their feathery points and become tiny grains of ice.When new snow fell on top of the old,it too turned into icy grains.So blankets of snow and ice grains mounted layer upon layer and were of such great thickness that the weight of the upper layers compressed the lower ones.With time and pressure from above,themany small ice grains joined and changed to larger crystals,and eventually the deeper crystals merged intoa solid mass of ice.

　　1.The author states that icebergs are rarely seen as they appear in_______________of the world.

　　2.From the passage,we can know that the shape of icebergs is___________________.

　　3.According to the passage,icebergs are scary and dangerous because they are likely to_______________________suprisingly.

　　4.What glaciers become when they break off and drift into the water?

　　5.What are the major factors in the process of the many small ice grains being merged into icebergs?

　　答案：

　　1.[faraway(distant/remote)waters(regions/areas)]

　　[定位]根據(jù)icebergs are rarely seen查找到第1段笫3句。

　　解析：題目中的appear in與of the world表明空格處需填入表地點(diǎn)的名詞。原文開篇提到大部分人都沒有見過冰山，從第3句可知，冰山形成于faraway, frigid waters，因此答案為faraway waters，也可以把faraway同義改寫成distant或remote，或者把waters(水域)用regions或areas代替。

　　2.[in an endless variety of shapes/various/different]

　　[定位]根據(jù)shape查找到第2段第2句。

　　解析：題目需要表語成分。從原文該句可知冰山的形狀各異，因此題目的答案可用appearing后的介詞短語作答，也可以簡要概括為various或different。

　　3.[roll over//turn over]

　　[定位]根據(jù)scary and dangerous和surprisingly查找到第3段第1句及最后一句。解析：題目需填入動詞原形，表明冰山可怕的原因。原文第3段介紹了冰山的可怕之處，最后兩句是原因所在。題目空格前的are likely to與原文最后一句的may是同義表達(dá)，所以答案為may后的動詞詞組。

　　4.[Icebergs.]

　　[定位]根據(jù)when從句的內(nèi)容定位到第4段第1句。

　　解析：題目中的when從句是原文that定語從句的部分內(nèi)容，原文句首的“Icebergs are parts of glaciers...”表明了冰山是由冰川的一部分形成，因此可知答案是Icebergs。

　　5.[Time and pressure(from above).]

　　[定位]根據(jù)small ice grains和merged into icebergs查找到最后一段最后一句。

　　解析：原文用With短語表達(dá)了眾多小冰粒是怎么樣形成大塊堅冰的，也就是題目所詢問的主要因素，因此答案為with后的賓語。