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
On viewing the lush plant growth of a tropical rain forest, most people would conclude that the soil beneath it is rich in nutri
On viewing the lush plant growth of a tropical rain forest, most people would conclude that the soil beneath it is rich in nutri
admin
2022-04-28
23
问题
On viewing the lush plant growth of a tropical rain forest, most people would conclude that the soil beneath it is rich in nutrients. However, although rain forest soils are highly variable, they have in common the fact that abundant rainfall washes mineral nutrients out of them and into streams. This process is known as leaching. Because of rain leaching, most tropical rain forest soils have low to very low mineral nutrient content, in dramatic contrast to mineral-rich grassland soils. Tropical forest soils also often contain particular types of clay that, unlike the mineral-binding clay of temperate forest soils, do not bind mineral ions well. Aluminum is the dominant cation (positively charged ion) present in tropical soils; but plants do not require this element, and it is moderately toxic to a wide range of plants. Aluminum also reduces the availability of phosphorus, an element in high demand by plants.
选项
A、The water in the streams flowing through tropical rain forests generally has relatively low mineral content.
B、The range of plants that grow in tropical rain forests is so wide that almost every kind of mineral in the soil gets used up.
C、The clay contained in tropical rain forest soils do not bind mineral ions well.
D、Abundant rainfall causes minerals to leach out of the soil.
答案
C,D
解析
本题问的是为什么大多数热带雨林土壤的矿物质养分含量相对较低,要求选出两个答案。第1句提出了一个谬误,即人们普遍认为热带雨林土壤富含营养。而第2句则用However来引出这种说法错误的第一个原因:abundant rainfall washes mineral nutrients out of them and into streams“充足的降雨导致矿物质养分从土壤中渗出并流入河流”。其中,washes mineral nutrients out of them对应D项的causes minerals to leach out of the soil。第3、4句解释何为leaching及其对土壤的作用,是对第2句的补充。第5句给出了热带雨林土壤矿物质养分含量相对较低的另一个原因:Tropical forest soils also often contain particular types of clay that…do not bind mineral ions well“热带森林土壤也通常含有特定类型的黏土,这些黏土不能很好地结合矿物离子”,C项基本复现了原句原词。因此,本题答案为C、D两项。
转载请注明原文地址:https://kaotiyun.com/show/VpfO777K
0
托福(TOEFL)
相关试题推荐
ChooseTWOletters,A-E.WhichTWOtopicsaboutchimpanzeeswillthestudentsdiscussnextweek?ATheyareslowerthanhumanin
Completethenotesbelow.WriteONEWORDONLYforeachanswer.ChimpanzeebehavioursSpeciesWecanfindPanorPanTroglodytes
Completethenotesbelow.WriteONEWORDONLYforeachanswer.EffectsofurbanenvironmentsonanimalsIntroductionRecenturba
Completethenotesbelow.WriteNOMORETHANTWOWORDSAND/ORANUMBERforeachanswer.ExampleMIDDLEBURYLANGUAGESCHOOLCLASS
Whichstatementcanbestfittoeachofthefollowingsituation?ChooseFIVEanswersfromtheboxandwritethecorrectletter,
HealthclubcustomerresearchExampleName:DanielTaylorOccupation:【L1】________Agegroup:
A、Therelationshipbetweenpaintingandsculpture.B、Theideasbehindanartist’swork.C、Thepracticalvalueofaworkofart.
A、SherealizestheequipmentiseasilydamagedB、Shewon’tforgettoputawaytheequipmentC、Shealwaysperformsexperimentsca
OvercomingtheLanguageBarrierThediscoverythatlanguagecanbeabarriertocommunicationisquicklymadebyallwhotra
Hisstrangebehaviorconfirmedhisneighborsintheir______thathewasguilty.
随机试题
权力性推动:
A.来自宿主细胞c-oncB.在感染早期具有重要的调节作用C.两者皆是D.两者皆非DNA肿瘤病毒携带的癌基因
女性,50岁,头痛发病,病程4个月,入院前出现左侧肢体无力和呕吐。入院检查,意识清,眼底视乳头水肿,左上下肢肌力Ⅳ级,腱反射活跃,病理征(+)。脑CT检查示:右颞顶部低密度灶,其外后方可见一略高密度结节,右侧脑室体受压,中线结构右移。增强示结节均匀强化
下列各项中,属于利得的是()
影响文化模式形成的最主要因素是()。
一个拥有工匠精神、推崇工匠精神的国家和民族,必然会少一些浮躁,多一些纯粹;少一些投机取巧,多一些_______;少一些_______,多一些专注持久;少一些_______,多一些优品精品。填入画横线部分最恰当的一项是:
ITS
FinancialAccountingStandardsBoard
随着心脏病成为人类的第一杀手。人体血液中的胆固醇含量越来越引起人们的重视。一个血液中的胆固醇含量越高,患致命的心脏病的风险也就越大。至少有三个因素会影响人的血液中胆固醇的含量,它们是抽烟、饮酒和运动。如果上述断定为真,则以下哪项一定为真?Ⅰ.某些生活方
A、Controlofnaturalhazards.B、Controlofheavytraffic.C、Controlofheartdisease.D、Controlofman-madehazards.D短文说,“在人类历史
最新回复
(
0
)