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
The world’s tropical rainforests comprise some 6% of the Earth’s land area and contain more than half of all known life forms, o
The world’s tropical rainforests comprise some 6% of the Earth’s land area and contain more than half of all known life forms, o
admin
2010-07-06
52
问题
The world’s tropical rainforests comprise some 6% of the Earth’s land area and contain more than half of all known life forms, or a conservative estimate of about 30 million species of plants and animals. 61)
Some experts estimate there could be two or even three times as many species hidden within these complex and fast- disappearing ecosystems — scientists will probably never know for certain so vast is the amount of study required Time is running out for biological research.
62)
Commercial development is responsible for the loss of about 17 million hectares of virgin rainforest each year — a figure approximating 1% of what remains of the world’s rainforests.
The current devastation of once impenetrable rainforest is of particular concern because, although new tree growth may in time repopulate felled areas, the biologically diverse storehouse of flora and fauna is gone forever. 63)
Losing this bountiful inheritance, which took millions of years to reach its present highly evolved state, would be an unparalleled act of human stupidity.
Chemical compounds that might be extracted from yet- to-be-discovered species hidden beneath the tree canopy could assist in the treatment of disease or help to control fertility. Conservationists point out that important medical discoveries have already been made from material found in tropical rainforests. The drug aspirin, now synthesised, was originally found in the bark of a rain- forest tree. Two of the most potent anti-cancer drugs derive from the rosy periwinkle discovered in the 1950s in the tropical rainforests of Madagascar.
The rewards of discovery are potentially enormous, yet the outlook is bleak. Timber-rich countries mired in debt view potential financial gain decades into the future as less attractive than short-term profit from logging. Cataloguing species and analysing newly-found substances takes time and money, both of which are in short supply. The developed world takes every opportunity to lecture countries which arc the guardians of rainforests. 64)
Rich nations exhort them to preserve and care for what is left, ignoring the fact that their wealth was in large part due-to the exploitation of their own natural world.
It is often forgotten that forests once covered most of Europe. Large tracts of forest were destroyed over the centuries for the same reason that the remaining rainforests are now being felled—timber. 65)
As well as providing material for housing, it enabled wealthy nations to build large navies and shipping fleets with which to continue their.
Plunder of the world’s resources. Besides, it is not clear that developing countries would necessarily benefit financially from extended bioprospecting of their rainforests. Pharmaceutical companies make huge profits from the sale of drugs with little return to the country in which an original discovery was made.
选项
答案
本题由两个并列句组成。在破折号前的句子中,含有一个省略了连接词的从句作estimate
解析
本题主要注意破折号后的部分。它相当于一个同位语,对前面的about 17 million hectares of virgin rainforest each year这个数字进行补充说明,其中含有一个what引导的从句作介词of的宾语。在词汇上, commercial development指“以赢利为目的的开发”,virgin rainforest指“原始雨林”,approximating指“近似于,接近”(它是figure的分词后置定语)。
转载请注明原文地址:https://kaotiyun.com/show/aYDd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
Predictionsofmanyrobotsinindustryhaveyetcometrue.Fortenyearsormore,manufacturersofbigrobotshaveexplainedhow
WhichofthefollowingappliestothemanagementofhumanresourcesinAmericancompanies?Whatisthemainideaofthepassage
WhichofthefollowingappliestothemanagementofhumanresourcesinAmericancompanies?Whatisthepositionoftheheadof
WhatwastheunderlyingsignificanceoftheinventionoftheKodak?Snapshot,asisexplainedinthepassage,refersto
Forcenturies,explorershaveriskedtheirlivesventuringintotheunknownforreasonsthatweretovaryingdegreeseconomican
Allthewisdomoftheages,allthestoriesthathavedelightedmankindforcenturies,areeasilyandcheaply【21】______toall
Man’spuzzlementandpreoccupationwithtimebothderiveultimatelyfromhisuniquerelationshiptoit.Allanimalsexistintim
【B1】Swedenhasgotapopulationofonly8million,butitisalargecountrywithanareaof450,000squarekilometers.【B2】The
Althoughtherehadbeenvarioussmallcamerasdeveloped,itwasnotuntilGeorgeEastmanintroducedtheKodakin1888thatt
Allthewisdomoftheages,allthestoriesthathavedelightedmankindforcenturies,areeasilyandcheaply【21】______toal
随机试题
关于“汗”的认识,哪项是错误的
不能纳入基本医疗保险用药范围的药品有()
(2008年)一定量的理想气体在进行卡诺循环时,高温热源的温度为500K,低温热源的温度为400K,则该循环的效率为()。
热拌沥青混凝土路面施工工艺包括()。
国际收支平衡表由三部分组成:一是经常项目;二是资本与金融项目;三是错误与遗漏项目,这三种项目均是根据实际发生的国际收支编制的。( )
在组建证券投资组合时,投资者需要注意( )。
影响学习动机的内部冈素是()。
根据下列文字资料回答下列问题。
Whereisthewomangoingtoday?
A、Theteacheraskedthewomantogiveatalkonchemistry.B、Theteacherpersuadedthewomannottotakethecourse.C、Theteach
最新回复
(
0
)