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
Endangered Species Endangered species are plants and animals that are in immediate danger of extinction. Extinction is actua
Endangered Species Endangered species are plants and animals that are in immediate danger of extinction. Extinction is actua
admin
2014-02-22
69
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.
This passage mentions all of the following reasons that cause the extinction of man species except______.
选项
A、natural selection of species
B、various natural disasters
C、commercial trade and killing
D、destruction of natural surroundings
答案
B
解析
细节判断题。注意题干中的except。由原文首段第二句的内容…actually a normal process in thecourse of evolution可知选项A正确。由第二段首句中的the destruction of natural habitats内容可知选项D正确。由尾段第二句的内容commercial trade and killing可知选项C正确。原文首段第四句提到了changes of climate,但原文没有提及natural disasters,故答案为B。
转载请注明原文地址:https://kaotiyun.com/show/TUQO777K
0
考博英语
相关试题推荐
Drunkendriving-sometimescalledAmerica’ssociallyacceptedformofmurder-hasbecomeanationalepidemic(流行病).Everyhour
EverysecondintheUnitedStatesalone,morethen250animalsareslaughteredforfood,addinguptomorethan8billionanimal
Aswomendemonstrateagrowingappetiteforconsumertechproducts,retailersandmanufacturersarestillonlybeginningtocate
Therearetwobasicwaystoseegrowth:oneasaproduct,theotherasaprocess.Peoplehavegenerallyviewedpersonalgrowtha
Billisanexampleofaseverelydisabledpersonwhohasbecome______atmanysurvivalskills.
TheproportionofworkscutforthecinemainBritaindroppedfrom40percentwhenIjoinedtheBBFCin1975tolessthan4perc
Hereisagreatironyof21st-centuryglobalpublichealth;Whilemanyhundredsofmillionsofpeoplelackadequatefoodasare
StandardEnglishisthevarietyofEnglishwhichisusuallyusedinprintandwhichisnormallytaughtinschoolsandtonon-nat
Despiteeffortstoprovidethemwithalternativessuchastheshelter,womenfrequentlyandrepeatedlyreturnedtoviolentanda
随机试题
A.羚羊角B.钩藤C.牛黄D.天麻治疗热病神昏,宜首选
晚期肝硬化患者的临床表现不包括
恒牙建牙合完成的时间
甲房地产经纪公司(以下简称甲公司)是一家知名的房地产经纪机构,吴某是甲公司的房地产经纪人。业主孙某委托甲公司以孙某名义销售自己的一处房产。吴某与孙某进行洽谈,最终甲公司同意为孙某销售其房产。随后,甲公司在一家报纸上刊登了有关孙某房产信息的广告。不久,刘某来
基坑(槽)开挖时,两人操作间距应( )。
某生产企业出口货物增值税“免抵退”税的会计核算采用《生产企业出口货物“免、抵、退”税汇总申报表》的申报数进行会计处理。2016年3月该企业《生产企业出口货物“免、抵、退”税汇总申报表》有关数据为:当期免抵税额为50000元,应退税额为20000元,则下列会
最佳现金持有量的存货控制模式中,应考虑的相关成本主要有()。
税务机关采取税收保全措施的期限,一般不得超过6个月,重大案件需要延长的,应报经批准。有权批准的税务机关是()。
科学技术的迅速发展,使得知识的创造和传播成为社会发展的主要动力,使人类进入知识经济时代,由此要求教育注重学生()的培养。
TheU.S.DepartmentofLaborstatisticsindicatethatthereisanoversupplyofcollege-trainedworkersandthatthisoversuppl
最新回复
(
0
)