首页
登录
职称英语
Even geologist is familiar with the erosion cycle. No sooner has an area of
Even geologist is familiar with the erosion cycle. No sooner has an area of
游客
2025-04-27
39
管理
问题
Even geologist is familiar with the erosion cycle. No sooner has an area of land been raised above sea-level than it becomes subject to the erosive forces of nature. The rain beats down on the ground and washed 1 the finer particles, sweeping them into rivulets and them into rivers and out to sea. The frost freezes the rain water in cracks of the rocks and breaks 2 even the hardest of the constituents of the earth’s crust. Blocks of rock dislodged at high levels are brought down by the force of gravity. Alternate heating and 3 of bare rock surfaces causes their disintegration. In the dry regions of the world the wind is a powerful force in removing material from one area to another. All this is natural. But nature has also provided certain defensive forces. Bare rock surfaces are in 4 course protected by soil,itself de-pendent initially on the weathering of the rocks. Slowly 5 surely,different types of soil with differing ’profiles’evolve the main types depending primarily on the climate. The protective soil covering,once it is formed,is hold together by the growth of vegetation. Grass and herbaceous plants, 6 long,branching tenuous roots,hold firmly together the surface particles. The 7 is true with the forest cover. The heavi-est tropical downpours beating on the leaves of the giant trees reach the ground only 8 spray,gently watering the surface layers and penetrating along the long passages provided by the roots to the lower levels of the soil. The soil,thus protected by grass,herb,or trees,furnishes a quiet habitat for a myriad varied organisms—earth-worms that importantly modify the soil,bacteria,active in their work of converting 9 leaves and decaying vegetation into humus and food for the growing plants. Chemical action is con-stantly taking 10 ;soil acids attack mineral particles and salts in solution move from one layer in the soil to another. [br]
选项
答案
with
解析
这里应该用介词with。空格处的意思是:草和草本植物,有着漫长的四处伸展的根系,它们把土壤表层的颗粒紧紧地维系在一起。
转载请注明原文地址:https://tihaiku.com/zcyy/4055952.html
相关试题推荐
Evengeologistisfamiliarwiththeerosioncycle.Nosoonerhasanareaof
Evengeologistisfamiliarwiththeerosioncycle.Nosoonerhasanareaof
Evengeologistisfamiliarwiththeerosioncycle.Nosoonerhasanareaof
Evengeologistisfamiliarwiththeerosioncycle.Nosoonerhasanareaof
Evengeologistisfamiliarwiththeerosioncycle.Nosoonerhasanareaof
Thefirstthingtonoticeisthatthemediawe’reallfamiliarwith—fromb
Thefirstthingtonoticeisthatthemediawe’reallfamiliarwith—fromb
Thefirstthingtonoticeisthatthemediawe’reallfamiliarwith—fromb
Thefirstthingtonoticeisthatthemediawe’reallfamiliarwith—fromb
Thefirstthingtonoticeisthatthemediawe’reallfamiliarwith--fromboo
随机试题
You’dbetterinvite______.A、boththemB、allthemC、themallC本题考查all的用法。all在此是形
NATOforeignministersaremeetinginLithuania[br][originaltext]NATOfo
It’ssimplyamazingwhatacellphonecandothesedays.Teenagersknowthis
[originaltext]M:You’renotlookingverycheerful.What’sthematterwithyou?
TheMid-summerDay.ahundred-year-oldtraditioninScandinavia,fallsonJu
哺乳期不宜使用的药物是A.鸡内金 B.莱菔子 C.麦芽 D.谷芽
下列选项中,属于房地产开发的全过程的有()。A.物业管理 B.竣工验收 C
你沿着自己选的那条路往前走,走了一阵子,前方出现了一条大河。河面宽约1500米
某市区甲企业为增值税一般纳税人,当期销售货物应纳增值税20万元,消费税15
路基工程施工应按设计要求进行()的动态观测。观测基桩必须置于不受施工影响的稳定地
最新回复
(
0
)