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
25
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
【C3】
选项
答案
K
解析
predominate动词,意为“占绝大多数”。本句的意思是在较为温暖的高纬度气候带占绝大多数的是由针叶树和阔叶落叶树组成的混合林。
转载请注明原文地址:https://kaotiyun.com/show/Ysn7777K
0
大学英语六级
相关试题推荐
Fromchildhoodtooldage,wealluselanguageasameansofbroadeningourknowledgeofourselvesandtheworldaboutus.When
Fromchildhoodtooldage,wealluselanguageasameansofbroadeningourknowledgeofourselvesandtheworldaboutus.When
A、He’lltrainyoungfootballers.B、He’llrunhisownbusiness.C、He’llstillbeplayingfootball.D、He’llbecomeafootballcomm
ThegovernmentofUKislaunchingaprogramaimingathelpingmorefamiliesbalancetheirworkandhomelives.Therighttoask
Cultureshockisaspecialdiseaseforpeoplewhohavesuddenlymovedtoaforeigncountry.Likemostillnesses,ithasitsown【
Whenyouaredevelopingathesis,remember______(不要包含和话题无关的内容)
Telecommunicationsisjustoneofthemeansbywhichpeoplecommunicateand,assuch,weneedtolookattelecommunicationsand
A、Strictandpicky.B、Responsibleandnice.C、Helpfulandpatient.D、Responsiblebuttoodirect.A选项均为表示人性格的形容词表明,本题可能考查某人的性格特征。
A、Becausethefishpopulationisincreasing.B、Becausethetemperaturethereisincreasing.C、Becausethetemperaturethereisd
ArtificialIntelligenceI’msurethatHansMoravecisatleastassaneasIam,buthecertainlybroughttomindtheclassic
随机试题
下列选项中,不属于消费行为类型的是()。
在体内可参与氧的转运与组织呼吸的是________。
嗜酸性粒细胞增多症外周血嗜酸性粒细胞绝对值大于下列哪一项
建设项目负责人的领导方式主要有( )。
将会计账簿分为序时账、分类账、备查账,其分类标志是()。
单击IE浏览器工具栏中的【后退】或【前进】按钮,则()。
关于异步电动机Y—△启动方法,下列说法正确的有()。
仰韶文化彩陶以________类型和________类型的彩陶艺术成就最为杰出。
设有向量组α1=(1,-1,2,4),α2=(0,3,1,2),α3=(3,0,7,14),α4=(1,-2,2,0),α5=(2,1,5,10),则该向量组的极大线性无关组是
MuchofcontinentalEuropeisinpoorshape.True,theaggregatewealthofpeopleislittlechangedandthesocialcapitalinmu
最新回复
(
0
)