首页
登录
职称英语
Forest is a complex ecosystem in which trees are the dominant life form. Tre
Forest is a complex ecosystem in which trees are the dominant life form. Tre
游客
2024-05-06
1
管理
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 [br] 【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://www.tihaiku.com/zcyy/3586108.html
相关试题推荐
TheGeneralElectricCompany,oftencriticizedforthecomplexityofitsstr
TheGeneralElectricCompany,oftencriticizedforthecomplexityofitsstr
TheGeneralElectricCompany,oftencriticizedforthecomplexityofitsstr
Forestisacomplexecosysteminwhichtreesarethedominantlifeform.Tre
Forestisacomplexecosysteminwhichtreesarethedominantlifeform.Tre
Forestisacomplexecosysteminwhichtreesarethedominantlifeform.Tre
Forestisacomplexecosysteminwhichtreesarethedominantlifeform.Tre
TheGeneralElectricCompany,oftencriticizedforthecomplexityofitsstr
TheGeneralElectricCompany,oftencriticizedforthecomplexityofitsstr
TheGeneralElectricCompany,oftencriticizedforthecomplexityofitsstr
随机试题
Aswalkingandsleeping,thesubjectwasalwaysinmymind.A、Walkingorsleeping
下列哪项不是室性心动过速的心电图特征A.P波与QRS波无固定关系 B.心室率较
患者,男,60岁,肥胖哮喘,近1个月来反复发作心绞痛,用硝酸甘油治疗效果不满意,
呕吐,纳少,呃逆,口渴咽干,舌红少苔,脉虚数,胃阴不足证,宜选用的方剂是A.清胃
下列关于课外活动的说法中,错误的是()。A.课外活动是教育学生的主要途径
简述研究幼儿心理时应坚持的原则。
抵押是担保的一种方式,根据《物权法》的相关规定,下列说法正确的是()。 A.
Helookedlikeaforeigner,buthisacce
贾先生在某商业银行办理了15年的个人住房抵押贷款。由于手续欠缺,在尚未办理他项权
在处理初期印象和新资料之间的矛盾时,心理咨询师应该()。A:固守旧印象 B:按
最新回复
(
0
)