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Scientists have long tried to be able to know more about floods.So far,the best that scientists can do is to recognize the conditions for flooding.
Although deep snow alone seldom causes floods,when it occurs together with heavy rain and sudden warmer weather,it can lead to serious flooding .If there is a fast snow melt(融化)on top of frozen or very wet ground,flooding is likely to occur.Melting snow also causes high water levels in rivers. Whenever rivers are already at their highest possible levels,heavy rains will result in the rivers'flooding the nearby land.
Rivers covered in ice can also lead to flooding.When ice begins to melt,it breaks into large pieces These pieces of ice move and float down the river.They can block the river,causing the water to rise and flood the land up the river.If theice dam(坝)breaks suddenly,the large quantity of water held behind it can flood the areas down the river too.
Broken ice dams are not the only problem that can cause flooding.When a large human-made dam breaks or fails to hold the water collected behind it,it will also cause serious damage
Although scientists cannot always know when floods will occur,they do know a great deal about
when floods are likely,or probably,going to occur
40.What have scientists achieved in dealing with floods?
A、They have prevented many rivers from flooding.
B、They have reduced the damage caused by floods
C、They have learned much about conditions for flooding
D、They have found most of the ice dams on the river.

答案是:C

解析：事实细节题。根据第一段可知，长期以来，科学家一直在试图更多地了解洪水。目前为止，他们 取得的最大进展就是了解了洪水暴发的条件。故本题选C。

出自 十大正规可靠体育平台最新优惠 > 英语 >  2019年十大正规可靠体育平台最新优惠高升专《英语》十大正规可靠体育平台最新优惠试卷与答案

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