首页
登录
职称英语
Biosphere II was a spectacular failure. The gleaming glass-and-concrete habi
Biosphere II was a spectacular failure. The gleaming glass-and-concrete habi
游客
2025-03-25
18
管理
问题
Biosphere II was a spectacular failure. The gleaming glass-and-concrete habitat sprawling across the desert in Oracle, Arizona, was supposed to support eight human "biospheri-ans" for two years, but the seal has to be broken before the experiment ended in 1993. Oxygen had fallen to levels normally seen at an elevation of 17,500 feet. Nitrous oxide had risen to the point where it threatened to cause brain damage. The fresh water supply became contaminated, and vines smothered(厚厚地覆盖)food plants. Insect pollinators(传授花粉的生物)and many other species became extinct. By the end, Biosphere II was overrun with swarms of ants and cockroaches.
Scientists who gathered recently to review the Biosphere II experiment reached a disturbing conclusion: "No one yet knows how to engineer systems that provide humans with the life-supporting services that natural ecosystems produce for free. "
The problem is that these ecosystems are undergoing wrenching changes. Water and air quality, while improving in some regions, are deteriorating in many others. Carbon dioxide levels in the atmosphere are climbing. The world’s population could reach 10 billion by 2050. And famed Harvard biologist Edward O. Wilson says the current rate of species losses puts us "in the midst of one of the great extinction spasms (突然迸发) of geological history. " All of which makes many ecologists wonder whether humans too will soon become extinct. It’s an incredibly important but incredibly difficult question. If we continue on this course, we’re heading for a world in which we will have to engineer services we’ve always received for free from nature. That’s why the failure of Biosphere II was so disturbing: It proves that we don’t yet know how to do that.
The Biosphere II experience demonstrated that maintaining human life is a tricky proposition, especially if we can no longer rely on the services provided by natural ecosystems. If we are currently living through a mass extinction, as Wilson believes, we should consider the past. In the great Permian extinction 245 million years ago, 96 percent of species perished. Eventually, the Earth was repopulated with a rich collection of new species, but it took 100 million years. "That should give pause to anyone who believes that what Homo sapiens(现代人) destroys, nature will redeem," Wilson says. "Maybe so, but not within any length of time that has meaning for contemporary humanity. " [br] It is implied that many ecologists
选项
A、believe the world’s ecosystems is in an undesirable condition
B、agree that the environment of the world is not as bad as it is thought to be
C、appear somewhat unconcerned about the state of the world’s environment
D、have thorough and comprehensive knowledge of the world’s environment
答案
A
解析
观点推断题。文中第三段指出环境、生态系统的种种恶化现象并指出生态学家对人类的生存提出了疑问,说明许多生态学家以为世界的环境生态系统处于很不乐观的状态。故A选项正确。
转载请注明原文地址:https://tihaiku.com/zcyy/4012122.html
相关试题推荐
TherearespectaculardifferencesbetweenfinancialmarketsontheContinent
BiosphereIIwasaspectacularfailure.Thegleamingglass-and-concretehabi
BiosphereIIwasaspectacularfailure.Thegleamingglass-and-concretehabi
Insomeways,theUnitedStateshasmadespectacularprogress.Firesnolong
Insomeways,theUnitedStateshasmadespectacularprogress.Firesnolong
Insomeways,theUnitedStateshasmadespectacularprogress.Firesnolong
Insomeways,theUnitedStateshasmadespectacularprogress.Firesnolong
Insomeways,theUnitedStateshasmadespectacularprogress.Firesnolong
Insomeways,theUnitedStateshasmadespectacularprogress.Firesnolong
Insomeways,theUnitedStateshasmadespectacularprogress.Firesnolong
随机试题
Whatisitthatkeepsthedevelopingworldinanapparentstateofperpetual
ItcanbeinferredfromthepassagethatMrs.SappletonwasallEXCEPT[br]Whic
[originaltext]Q:Excuseme,mayIseeyourbossnow?[/originaltext][originaltext
SydneyOperaHousemustbeoneofthemostrecognizableimagesofthemodern
这种分类方法,便于应用物理化学的原理来阐明各类制剂特征()A:按给药途径分类
A.奎尼丁 B.普萘洛尔 C.维拉帕米 D.胺碘酮 E.毛花苷C房室结内
利用基础金融衍生工具的结构化特性。通过相互结合开发设计出更多具有复杂特性的金融衍
下列药物的药汁,均可作为水丸的黏合剂,除了A大葱 B乳汁 C樟脑 D猪胆汁
对盐酸麻黄碱描述正确的是A、属苯丙胺类 B、不具有中枢作用 C、药用(S,S
口服剂型在胃肠道中吸收快慢的顺序一般认为是A:混悬剂>溶液剂>胶囊剂>片剂>包衣
最新回复
(
0
)