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
考研
Biological diversity—or biodiversity—is the term given to total variety and complexity and interactions of all life on Earth. Th
Biological diversity—or biodiversity—is the term given to total variety and complexity and interactions of all life on Earth. Th
admin
2015-04-10
80
问题
Biological diversity—or biodiversity—is the term given to total variety and complexity and interactions of all life on Earth. The biodiversity we see today is the result of billions of years of evolution, shaped by natural processes and, increasingly, by the influence of humans. It forms the web of life of which we are an integral part and upon which we so fully depend.
【C1】______
In the last 50 years we have lost 300,000 species. Species are disappearing between 100 and 1,000 times as fast as they were before humans arrived. One in four mammal species and one in eight bird species face a high risk of extinction in the near future and the population of each species is expected to fall by at least a fifth in the next 10 years.
【C2】______
There are a number of factors that threaten biodiversity and the vast majority of them are attributable to human activity.
There is less and less wilderness in the world. An increasing human population is taking up ever more land for agriculture and accommodation.
After habitat loss, the biggest threat to biodiversity is invasion by non-native species. These non-native species have arrived mainly through trade and tourism.
【C3】______
Another threat comes from the illegal trade in wild animals and plants. According to some authoritative sources, the international illegal trade in wildlife is worth an estimated £ 5 billion a year. It is second only to the narcotics trade. According to their research, some 500 million animals and plants are traded across borders each year, a quarter of them illegally.
Given the fact that trade in wild animals and plants crosses borders between countries so international cooperation is needed to safeguard certain species from over-exploitation. CITES helps coordinate this effort.
CITES or the Convention on International Trade in Endangered Species of Wild Fauna and Flora is an international agreement between governments. Its aim is to ensure that international trade in specimens of wild animals and plants does not threaten their survival.
【C4】______
Other threat to biodiversity include the pet trade. It is estimated that nine out of ten parrots imported for the pet trade come from the wild. In addition, disease, hunting, pest control, pollution, human eating and the keeping of domestic animals.
The good news is that people have realized the serious consequences resulting from inappropriate human activity.
【C5】______
[A]Invertebrates aren’t faring so badly—only around 0. 1 percent of the 1. 6 million known species are thought to be threatened—but it’s possible that many undiscovered species will die out before we even know of their existence.
[B]The World Health Organization estimates that more than 60 percent of the world’s population relies on plants for primary healthcare. There are 3,000 plant species used in birth control alone. With great demand for medicine, many herbs, some of which are rare plants, have been killed out.
[C]World leaders have agreed a comprehensive strategy for "sustainable development", that is meeting our needs while ensuring that we leave a healthy and viable world for future generations. They have reached a consensus that the world’s ecological richness should be preserved as nations further their economic development.
[D]Deplorably, biodiversity is being undermined.
[E]Today, it accords varying degrees of protection to more than 30,000 species of animals and plants, whether they are traded as live specimens, fur coats or dried herbs.
[F]The Galapagos Islands have almost as many introduced species as native ones. Invasive plant species already cover 400,000 sq km of the U. S., and are spreading at a rate of 12, 000 sq km a year. Non-native species alter habitat by changing the vegetation, competing with native species, and preying on native species.
[G]Rural communities in more than 60 countries get much of their protein from wild animal meat. Overpopulation, famine and the spread of high-powered rifles are killing off this source of food and people are going hungry.
【C4】
选项
答案
E
解析
此项紧接上文,说明CITES责任重大,这一公约要保证三万多种动植物不会被人滥用,不论人们用它们制作皮大衣、活标本还是干药材等。
转载请注明原文地址:https://kaotiyun.com/show/FD74777K
0
考研英语一
相关试题推荐
Energywillbeoneofthedefiningissuesofthiscentury.Onethingisclear:theeraofeasyoilisover.Whatwealldonext
Energywillbeoneofthedefiningissuesofthiscentury.Onethingisclear:theeraofeasyoilisover.Whatwealldonext
Fromthefirstthreeparagraphs,welearnthat______.Accordingtothetext,"nucleartippedmissiles"and"cannonball-sizest
"Myownfeelingswentfromdisbelieftoexcitementtodownrightfear",saysCarlHergenrother,23,anArizonaundergraduatewho
It’snevertooearlyortoolateforaparenttobecomeateacher.Inthisageofteacheraccountability,endlessschooltesting
WhyisEnglishdifficultaccordingtothetext?WhathadbroughtFrenchwordsintomoregeneraluse?
ImagineaBriton’snewyearresolutions:hevowstostopsmoking20cigarettesaday,andabandonhisdailybottleofclaretand
ImagineaBriton’snewyearresolutions:hevowstostopsmoking20cigarettesaday,andabandonhisdailybottleofclaretand
【F1】Medicinetodayfocusesprimarilyondrugsandsurgery,genesandgerms,microbesandmolecules,yetloveandintimacyarea
Wherecultureisconcerned,inMadridvarietyreigns.Withmodernartcenters【B1】______fromdiscardedfactoriesandtraditional
随机试题
取得直接关系公共利益的特定行业的市场准入行政许可的被许可人,应当按照国家规定的服务标准、资费标准和行政机关依法规定的条件,向用户提供安全、方便、稳定和价格合理的服务,并履行普遍服务的义务;未经作出行政许可决定的行政机关批准,不得擅自停业、歇业()
如果原水碱度过低,造成混凝不良,可加适量石灰或其他碱化剂提高碱度。
神经垂体分泌的激素主要有___________和催产素。
流行性乙型脑炎最具特征性的病变是
资金结构的合理化由多方面决定,主要有()。
下列各项中,不应计入销售费用的是()。
下列关于中国刑法适用范围的说法,哪个是正确的?()
癌症患者只要接受化疗,就会承受很强的副作用,而化疗的副作用会导致癌症患者抵抗力下降,因此,抵抗力下降的人容易患癌症。以下哪项与上文中的推理最接近?
以下说法中正确的是()。
Ifyouassociatewithsuchpeople.I’mafraidyou______serioustrouble.
最新回复
(
0
)