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
Forest is a complex ecosystem in which trees are the dominant life form. Tree dominated forests can occur wherever the temperatu
Forest is a complex ecosystem in which trees are the dominant life form. Tree dominated forests can occur wherever the temperatu
admin
2013-06-02
23
问题
Forest is a complex ecosystem in which trees are the dominant life form. Tree dominated forests can occur wherever the temperatures rise above 50°F(10℃) in the warmest months and the annual【C1】______ is more than 8 in. (200mm). They can develop under various conditions within these limits, and the kind of soil, plant, and animal life differs according to the extremes of environmental influences. In cool, high-latitude subpolar regions, taiga forests are dominated by【C2】______ conifers (针叶松). In more temperate high-latitude climates, mixed forests of both conifers and broad-leaved deciduous trees【C3】______ . Broad-leaved deciduous forests develop in midlatitude climates. In humid equatorial climates, tropical rain forests develop. There heavy rainfall supports evergreens that have broad leaves instead of the needle leaves of cooler evergreen forests. Forests are among the most complex ecosystems in the world, with extensive vertical layering. Conifer forests have the simplest structure: a tree layer, a shrub layer that is【C4】______ or even absent, and a ground layer covered with lichens, mosses, and liverworts. Deciduous forests are more complex (the tree canopy is divided into an upper and lower story), and rain-forest canopies are divided into at least three layers. The forest is nature’s most efficient ecosystem, with a high rate of【C5】______ affecting both plant and animal systems in complex organic relationships.
Rain forest is lush forest, generally composed of tall, broad-leaved trees and usually found in wet tropical regions around the equator. Depending on the amount of annual rainfall, the trees may be evergreens or mainly deciduous. The former require more water. Soil conditions vary with location and climate, though most rain-forest soils tend to be permanently moist and not very【C6】______ , because the hot, humid weather causes organic matter to decompose rapidly and to be absorbed quickly by tree roots and fungi. Rain forests have many vertical layers of plant and animal development. The highest plant layer, the tree canopy,【C7】______ to heights of 100-165 ft (30-50 m). Animals there mostly feed and escape from predators among leaves and branches. The next-highest layer is filled with small trees. Above the ground surface the space is occupied by tree branches, twigs, and 【C8】______ . Many species of animals live in the undergrowth. Contrary to popular belief, the rain forest floor is not impassable, being bare except for a thin layer of humus and fallen leaves. Animals【C9】______ this layer are adapted to walking and climbing short distances Burrowing animals are found below the soil surface, as are microorganisms that help decompose and free much of the organic litter accumulated by other plants and animals from all layers. The climate of the ground layer is unusually【C10】______ because the upper stories of tree canopies and the lower branches filter sunlight and heat radiation and reduce wind speeds, keeping the temperatures fairly even.
A. resort I. extends
B. stable J. inhabiting
C. conform K. predominate
D. foliage L. biology
E. fertile M. spotty
F. apprentice N. precipitation
G. photosynthesis O. perishing
H. hardy
【C9】
选项
答案
J
解析
inhabiting现在分词作定语,意为“栖居于”。本句的意思是说栖居于这腐殖质和落叶层的动物已能适应短距离的行走和攀爬。
转载请注明原文地址:https://kaotiyun.com/show/csn7777K
0
大学英语六级
相关试题推荐
Businessandgovernmentleadersalsoconsidertheinflationratetobeanimportantgeneralindicator.Inflationisaperiodof
NewLightinInternetServiceAnewinternetserviceLookingfor"TheFugitive?"Didn’tgetenough"EightIsEnough?"Would
A、Businessassociates,B、Bossandsecretary.C、Teacherandstudent.D、Goodfriends.A综合推断题。男士说很高兴在一起工作,希望能再次合作,女士对此表示赞同,由此推断,两人是
A、Inthestudent’sownwords.B、Indirectquotations.C、Inshortphrases.D、Inshorthand.A
A、Manyguestsdidn’tgiveaperformanceattheparty.B、Manyguestsdidn’tshowtheirfaces.Theyaremasks.C、Thepartywasn’t
A、Theyaredelightedbecausetheycanenjoythescenerywhiledriving.B、Theyarefrightenedbecausetrafficaccidentsarefrequ
A、Hetellsherhonestlywhathethinksaboutit.B、Shecantellbyhisnon-verbalexpressions.C、Hethrowsitawayaftermaking
A、Thehightemperaturesrequiredforitsuse.B、Thehighcostofmaterialsusedinitsproduction.C、Thelackoftrainedenviron
A、Thewomenhavemorefreedomandcanshareindecisions.B、Thewomendonothavetobetheheadsofthefamily.C、Thewomen’sr
随机试题
监控调查人员的内容包括
以概念、判断、推理的形式进行的思维是_______。
坚持以深化外交布局为依托打造全球伙伴关系。中国将努力构建()的大国关系框架。
婴幼儿下呼吸道解剖特点有
外周全血细胞减少、骨髓增生低下、三系造血细胞减少,符合
男性,10岁,突发剑突下阵发性剧烈绞痛3小时,发作时辗转不安、痛苦呻吟。伴恶心、呕吐。发作过后如常人。体格检查:无发热、无黄疸,腹平软。无明显压痛。白细胞计数正常。应诊断为何病
某河港码头建筑物地基为均质土地基,tanδ=0.0,地基土的黏聚力标准值ck=15kPa,内摩擦角φk=15°,建筑物基础的计算面宽度Be=6.0m,计算面以上边载qk=150kPa,计算面以下土饱和重度为20kN/m。。经计算,地基土处于极限状态下的Nr
()是利率市场化机制形成的核心。
下列句子中没有语病的一项是()。
A theincidenceofmesotheliomaisextremelylowB whichmayextendfrom25to30yearafterinitialexposureC whereasthel
最新回复
(
0
)