首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Even geologist is familiar with the erosion cycle. No sooner has an area of land been raised above sea-level than it becomes sub
Even geologist is familiar with the erosion cycle. No sooner has an area of land been raised above sea-level than it becomes sub
admin
2012-10-23
52
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.
选项
答案
due
解析
in due course的意思是“在一定的时候”。空格处的意思是:适当的时候,裸露的岩石表层受到土壤保护,而土壤本身主要是由于受风雨侵蚀的岩石风化而成的。
转载请注明原文地址:https://kaotiyun.com/show/aX9O777K
0
考博英语
相关试题推荐
Yetthedifferenceintoneandlanguagemuststrikeus,sosoonasitisphilosophythatspeaks:thatchangeshouldremindusth
Yetthedifferenceintoneandlanguagemuststrikeus,sosoonasitisphilosophythatspeaks:thatchangeshouldremindusth
Whenwecreditthesuccessfulpeoplewithintelligence,physicalstrengthorgoodluck,wearemakingexcusesforourselvesbeca
ForthepeoplewhohavenevertraveledacrosstheAtlanticthevoyageisafantasy.Butforthepeoplewhocrossitfrequentlyo
ForthepeoplewhohavenevertraveledacrosstheAtlanticthevoyageisafantasy.Butforthepeoplewhocrossitfrequentlyo
ForthepeoplewhohavenevertraveledacrosstheAtlanticthevoyageisafantasy.Butforthepeoplewhocrossitfrequentlyo
Someweeksago,ridinginacabfromBostontoCambridge,mydriverturnedandaskedmewhatIdidforaliving."TeachEnglish,
Someweeksago,ridinginacabfromBostontoCambridge,mydriverturnedandaskedmewhatIdidforaliving."TeachEnglish,
(66)GNPbecomesanobsoletemeasureofprogressinasocietystrivingtomeetpeople’sneedsasefficientaspossibleandwitht
随机试题
受托人或者被聘用人管理个人独资企业的依据是:()
用电流表测得的交流电流的数值是交流电的()值。
A.剪接B.甲基化修饰C.两者皆有D.两者皆无原核rRNA前体加工通常需要经过
设计与施工分离,施工单位“按图施工”,基本上处于被动地位,在一定程度上影响其()的发挥。
标的证券为股票的,不符合的条件有()。
全国人民代表大会常务委员会对宪法和法律的解释是()。
[*]
极坐标系下的累次积分f(rcosθ,rsinθ)rdr.
【说明】某公司采用100M宽带接入Internet,公司内部有15台PC机,要求都能够上网。另外有2台服务器对外分别提供Web和E-mail服务,采用防火墙接入公网,拓扑结构如下图所示。
数据流图用于抽象描述一个软件的逻辑模型,数据流图由一些特定的图符构成。下面图符名标识的图符不属于数据流图合法图符的是
最新回复
(
0
)