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
2015-01-09
85
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【R1】______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【R2】______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【R3】______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【R4】______course protected by soil,itself de-pendent initially on the weathering of the rocks. Slowly【R5】______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, 【R6】______long,branching tenuous roots,hold firmly together the surface particles. The【R7】______is true with the forest cover. The heavi-est tropical downpours beating on the leaves of the giant trees reach the ground only【R8】______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【R9】______leaves and decaying vegetation into humus and food for the growing plants. Chemical action is con-stantly taking【R10】______;soil acids attack mineral particles and salts in solution move from one layer in the soil to another.
【R5】
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://kaotiyun.com/show/3sLO777K
0
考博英语
相关试题推荐
Wal-MartannouncedThursdayafternoonthatitwouldintroduceaprogramnationwidecalled(61)"PickUpToday"thatallowscustome
Wal-MartannouncedThursdayafternoonthatitwouldintroduceaprogramnationwidecalled(61)"PickUpToday"thatallowscustome
Wal-MartannouncedThursdayafternoonthatitwouldintroduceaprogramnationwidecalled(61)"PickUpToday"thatallowscustome
Veryoldpeopledoraisemoralproblemsforalmosteveryonewhocomesincontactwiththem.Theirvalues—thiscan’tberepeated
Therearethreeseparatesourcesofhazard【1】totheuseofnuclearreactiontosupplyuswithenergy.Firstly,theradioactivem
Therearethreeseparatesourcesofhazard【1】totheuseofnuclearreactiontosupplyuswithenergy.Firstly,theradioactivem
Therearethreeseparatesourcesofhazard【1】totheuseofnuclearreactiontosupplyuswithenergy.Firstly,theradioactivem
Arrivinganywherewiththesepossessions,hemightjustaseasily______foramonthorayearasforasingleday.
Ifitistruethatmoralitycannotexistwithoutreligion,thendoesnottheerosionofreligionheraldthe______ofmorality?
随机试题
简述公务员福利的作用。
传染病的基本特征有()
女,45岁,外阴奇痒2年余,外阴皮肤增厚,纹理突出,且由于长时间搔抓出现不同程度的破损、皲裂、隆起。为确诊,应进行下列哪种检查
某截瘫病人,入院时骶尾部压疮,面积2.5cm×2cm,深达肌层,创面有脓性分泌物,周围有黑色坏死组织。护理措施是
下列()等情形不应当成立累犯。
刘先生拟从子女上小学四年级就开始准备子女上大学的基金。6年期与3年期教育金储蓄的优惠利率分别为3.6%和3.24%,则9年后上大学时可累积的教育金数额为( )元。
甲公司于2016年向意大利的乙公司出售一处位于中国境内的房产,乙公司在意大利将房款支付给了甲公司在意大利的分支机构。就该笔转让所得,甲公司有义务向中国主管税务机关申报缴纳企业所得税。()。
选做题Ⅰ根据所学知识分析材料回答问题:2005年7月7日英国伦敦发生多起地铁和公共汽车爆炸,现已确认爆炸为自杀式爆炸。英国《卫报》于18日发表文章说,调查表明英国爆炸案的制造者可能与巴基斯坦的极端分子有关,而巴基斯坦驻联合国大使穆尼尔.阿克
求平面x+2y一2z+6=0和平面4x—y+8z一8=0的交角的平分面方程.
Tosaythatthechildlearns【C1】______imitationandthatthewaytoteachistosetagoodexampleoversimplifies.Nochildimit
最新回复
(
0
)