erosion()
A.腐蚀
B.爆发
C.减少
D.邪恶
AC
A.腐蚀
B.爆发
C.减少
D.邪恶
AC
第2题
A.corrosion
B.wear
C.construction
D.lung
第3题
A.stop,into
B.prevent,to
C.prevent,from
D.stop,to
第4题
A.pollution
B.excellence
C.explosion
D.erosion
第5题
The erosion of the white cliffs in the south of England ________.
A) will soon become a problem for people living in central England
B) has now become a threat to the local residents
C) is quickly changing the map of England
D) can be stopped if proper measures are taken
第6题
What can contribute to drought?
[A] over-farming and soil erosion
[B] soil moisture
[C] water conservation
[D] natural disasters
第7题
Why is it that under certain circumstances, the plant cover is unable to regenerate itself, thus setting the stage for serious erosion (腐蚀)? To answer this question, let us take an extreme example, the destruction of tropical rain forests. In general, the equatorial (赤道附近的) soil is poor: forests can exist in these regions only because they are part of a balanced cycle. All that the forest produces is returned to the forest. The organic matter that falls from the trees constitutes the humus (腐殖土) that the forest requires. When people cut down all the trees to make room for crops, the soil is laid bare and, deprived of shade, heats up. An increase in soil temperature increases the rate of decomposition (分解) of organic matter. Organic nitrogen (氮) is converted into soluble ammonia (氨) and nitrates (硝酸盐), which the rains quickly leach (沥滤,溶滤)away. It has been calculated that a rise in temperature from 77 to 78.8 may increase the loss of nitrogen by fifteen to twenty pounds per acre per year. With the fertility of soil destroyed, an irreversible change from forest to desert can be initiated.
What do people usually think contributed to the decline of North Africa?
A.Human factors.
B.Economic factors.
C.Climatic factors.
D.Population factors.
第8题
The author mentions all of the following as causes of erosion EXCEPT ______.
A.wind
B.rain
C.heat
D.cold
第9题
The erosion of the white cliffs in the south of England
[A] will soon become a problem for people living in central England
[B] has now become a threat to the local residents
[C] is quickly changing the map of England
[D] can be stopped if proper measures are taken
第10题
The erosion can be stopped if proper measures are taken.
A.Right
B.Wrong
C.Not mentioned
第11题
The word erosion in Paragraph 1 is closest in meaning to ______.
A.decrease
B.abstraction
C.disparity
D.corrosion