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
48
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
but
解析
这里应该用but。空格处的意思是:缓慢但确定无疑地,在不同气候的作用下,不同轮廓的不同类型的土壤都发生着变化。
转载请注明原文地址:https://www.kaotiyun.com/show/iX9O777K
0
考博英语
相关试题推荐
Aneducationshouldenableastudenttogetabetterjobthanhewould______beabletofindorfill.
Yetthedifferenceintoneandlanguagemuststrikeus,sosoonasitisphilosophythatspeaks:thatchangeshouldremindusth
Somereadersmayfindit______thatabookarguingforgreaterliteracyandintellectualdisciplineshouldleadtoacallforl
ForthepeoplewhohavenevertraveledacrosstheAtlanticthevoyageisafantasy.Butforthepeoplewhocrossitfrequentlyo
Theoppositeofadaptivedivergenceisaninterestingandfairlycommonexpressionofevolution.Whereasrelatedgroupsoforgan
Whatweconsideraluxuryatonetimefrequentlybecomesa______,manyfamiliesfindthatownershipoftwocarsisindispensabl
Thereisanewtypeofsmalladvertisementbecomingincreasinglycommoninnewspaperclassifiedcolumns.Itissometimesplaced
Theactresswasvery______attheinsultingquestionraisedbyheropponentattheconference.
ThepoetryofGwendolynBrookshasbeenpraisedfordeepeningthesignificanceofpersonalandsocialexperiencessothatthese
(66)GNPbecomesanobsoletemeasureofprogressinasocietystrivingtomeetpeople’sneedsasefficientaspossibleandwitht
随机试题
一般全口基托的唇、颊边缘伸至黏膜反折处的主要目的是
投射性测合中的洛夏墨迹试验,用于
财务报表的数据只来源于总账系统,并且取数要通过函数实现。()
下列各项中,属于企业在投资决策过程中必须考虑的因素有()。
表明企业没有能力将具有固定期限的金融资产投资持有至到期的情况有()。
下列项目中计征个人所得税时,允许从总收入中减除费用800元的有()。
【2012下】《国家中长期教育改革和发展规划纲要(2010——2020年)》提出了构建灵活开放的教师教育体系的改革目标,关于这一目标,下列表述中正确的一项是()。
泡利不相容原理说明()。
设λ0为A的特征值.求A2,A2+2A+3E的特征值;
阅读下列说明,回答问题1至问题4,将解答填入答题纸的对应栏内。【说明】建设单位甲通过公开招标选择承建单位乙承担某电子商务应用项目的实施任务,并委托监理单位丙对项目实施全过程监理。该工程项目涉及机房建设、系统集成和应用软件开发等建设内容。在建设过程中,发
最新回复
(
0
)