首页
登录
职称英语
Endangered Species Endangered species are plants
Endangered Species Endangered species are plants
游客
2025-04-14
24
管理
问题
Endangered Species
Endangered species are plants and animals that are in immediate danger of extinction. Extinction is actually a normal process in the course of evolution. Since the formation of the earth, many more species have become extinct than those exist today. These species slowly disappeared because of changes of climate and their failure to adapt to such conditions as competition and predation(捕食). Since the 1600s, however, the process of extinction has greatly accelerated as a result of both human population growth and technological encroachment(侵犯)on natural ecology systems. Today the majority of the world’s environments are changing faster than the ability of most species to adapt to such changes through natural selection.
Species become extinct or endangered for a number of reasons, but the primary cause is the destruction of natural habitats(栖息地). Drainage of wetlands(沼泽地), cutting and clearing of forests, growth of cities, and highway and dam construction have seriously reduced available natural habitats. As the various surroundings become fragments, the remaining animal populations crowd into smaller areas, causing further destruction of natural surroundings. Species in these small islands lose contact with other populations of their own kind, thus reducing their genetic variation and making them less adaptable to environment changes.
Since the 1600s, commercial exploitation of animals for food and other products has caused many species to become extinct or endangered. Introduced diseases and parasites have also greatly reduced some species. Pollution is another important cause of their extinction.
Some private and governmental efforts have been organized to save declining species. Laws were made in some countries in the early 1900s to protect wild animals from commercial trade and killing. International endeavors are shown in the Convention on International Trade in Endangered Species, approved by 51 nations. Its purpose is to restrict exploitation of wild animals and plants by regulating and restricting trade in certain species. How effective such laws will be in various countries, however, depends on enforcement(实施)and support by the people and the courts. Because of a lack of law enforcement, the willingness of some segments of society to trade in endangered species, the activities of people who catch and kill animals illegally and dealers who supply the trade, the future of many species is in doubt in spite of legal protection. [br] In the last sentence of the second paragraph, the word "islands" refers to______.
选项
A、the lands that are completely surrounded by water
B、the wild animals’ breeding grounds protected by law
C、the pieces of land separated by modern buildings and roads
D、the small and isolated areas inhabited by certain species
答案
D
解析
语义题。注意small islands前的these,these指代前面的smaller areas内容,这个islands是由theremaining animal populations围成的,与选项D中的certain species对应。故答案为D。选项A中的water,选项B中的the wild animals’breeding,选项C中的modern buildings and roads原文均没有提及。
转载请注明原文地址:https://tihaiku.com/zcyy/4036960.html
相关试题推荐
Whenbotheredbyotheranimalsorhumans,somespeciesofhornedlizardswillpo
Plantadaptationcanberemarkablycomplex.Certainspeciesoforchids,fori
Plantadaptationcanberemarkablycomplex.Certainspeciesoforchids,fori
Plantadaptationcanberemarkablycomplex.Certainspeciesoforchids,fori
Thesheerdiversityoftropicalplantsrepresentsaseemingly______sourceofraw
EndangeredSpeciesEndangeredspeciesareplants
EndangeredSpeciesEndangeredspeciesareplants
EndangeredSpeciesEndangeredspeciesareplants
Someplantsare____todiseaseandmustbetakengoodcareofforthewholegrowi
Evenplantscanrunafever,especiallywhenthey’reunderattackbyinsects
随机试题
【B1】[br]【B3】A、appearanceB、frameworkC、outlookD、structureA词义辨析。framework
发生火灾时,干式系统的闭式喷头受热开启,管道中的有压气体从喷头喷出,干式报警阀系
驾驶机动车遇有前方交叉路口交通阻塞时应怎么办?()A.可借对向车道通过 B.
男性,38岁,因吞咽困难,严重消瘦到医院就诊,食管吞钡检查示食管下段呈鸟嘴样改变
( )是指借款人无力或未按照约定按时还本付息或支付有关费用日寸贷款的第二还款来
分析毕加索的《格尔尼卡》。
阅读材料,回答下列问题。 《三峡》原文 自三峡七百里中,
施工合同文件中,优先于投标函及投标函附录的是()。A:中标通知书 B:专用合
共用题干 ADHDLinkedtoAirPollutantsChild
站用交流电源柜内,具有脱扣功能的低压断路器应设置一定()(A)阈值(B)冷却
最新回复
(
0
)