Although given less publicity, the agricultural damage done by the many smaller, more frequent floods usually far exceeds the losses caused by the very grand ones. In the Central States, ditches and drains cause the flows from spring rains and melting snow to run far more rapidly than in the days before white men settled on the land. Once, excess spring flood waters emptied into lakes and swampy lands, there to be detained for slow release into stream and rivers. Now, systematic drainage has actually eliminated these natural reservoirs.
In the more rolling sections of the East, spring runoff was formerly absorbed and held temporarily in the porous soils beneath the unbroken expanse of forest. When large areas were converted to farm use, removal of the forest and the practice of up-and-down hill plowing deprived the soils of much of their ability to catch and store water.
The effects of eliminating the natural forest cover are shown in the gullied farm lands and widened stream channels found in some densely settled areas. Partly because the stream channels are more or less filled with material washed down from the uplands, and partly because storm runoff has increased, the channels are today no longer able to carry all the flow from heavy rains. This explains why the streams overtop banks far more often than in the days before settlement.
26. The best title for the selection would be______.
A. River Rising! River Rising! B. Forests and Floods
C. Flooding in the U. S. D. The Results of Flooding
27. All of the following cause floods EXCEPT______.
A. heavy rain B. melting snow
C. increasing storm runoff D. porous soil
28. The author states that______.
A. lakes and swamps once acted like natural reservoirs
B. up-and-down hill plowing catches and stores water
C. stream channels are the best carriers of water
D. floods are easily prevented and controlled
29. According to the selection, streams overtop their banks partly because______.
A. material from higher land is washed into them
B. ditches and drains lead into them
C. rivers become too swift
D. snow melts more rapidly nowadays
30. The floods which are given most publicity______.
A. cause no damage
B. cause the most damage
C. cause less agricultural damage than the many smaller, more frequent floods
D. far exceed the smaller, more frequent floods in agricultural loss
26. C 27. D 28. A 29. A 30. C
BEC中级真题阅读精讲:第4辑T2P3 Critical Path
BEC中级真题阅读精讲:第4辑T2P5 面对艰难时刻
商务英语(BEC)中级考试历年真题(25)
2011-2013年BEC中级口试考试真题汇总
2010年下半年BEC中级考试真题回顾
商务英语(BEC)中级考试历年真题(21)
BEC中级真题阅读精讲:第2辑T2P4 处理好与上司的关系
BEC中级真题阅读精讲:第3辑T4P1 SunTours
BEC中级真题阅读精讲:第4辑T3P4 在线交易
BEC中级真题阅读精讲:第2辑T1P2 自助餐领域
BEC中级真题阅读精讲:第4辑T2P4 Fighting Fit
BEC中级真题阅读精讲:第4辑T3P3 劝的艺术
BEC中级真题阅读精讲:第4辑T2P4 Fighting Fit
BEC中级真题阅读精讲:第2辑T2P2 找到合适的人
2014年5月BEC中级真题(网友回忆版)
商务英语(BEC)中级考试历年真题(20)
商务英语(BEC)中级考试历年真题(23)
BEC中级真题阅读精讲:第2辑T1P3 怎样开发自己
BEC中级真题阅读精讲:第2辑T2P3 百货商店魔力
2010年商务英语(BEC)中级阅读考试真题及答案
BEC中级真题阅读精讲:第4辑T1P4电子商务的成功秘诀
BEC中级真题阅读精讲:第4辑T2P1 Outsourcing外购
BEC中级真题阅读精讲:第4辑T1P2收购
BEC中级真题阅读精讲:第4辑T1P3工作场所的创造力
2010年商务英语(BEC)中级阅读全真试题(二)
商务英语(BEC)中级考试历年真题(28)
BEC中级真题阅读精讲:第2辑T2P1 Listening
商务英语(BEC)中级考试历年真题(30)
商务英语初级(BEC1)历年真题(2)
BEC中级真题阅读精讲:第3辑T4P3 实现成功的合并
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |