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
When scientists first warned in the 1970s that CFCs could attack ozone, the U.S. responded by banning their use in spray cans. B
When scientists first warned in the 1970s that CFCs could attack ozone, the U.S. responded by banning their use in spray cans. B
admin
2010-04-28
34
问题
When scientists first warned in the 1970s that CFCs could attack ozone, the U.S. responded by banning their use in spray cans. But the rest of the world continued to use CFC -based aerosol cans, and overall CFC production kept growing. The threat became far clearer in 1985, when researchers reported a "hole" in the ozone layer over Antarctic. Although the size of the bole varies with the seasons and weather patterns, at times Antarctic ozone has been depleted by as much as 50% in some spots. As a result of this disturbing de- velopment,24 nations, including the U. S. and the Soviet Union, met in Montreal two summers ago and a- greed to cut back on CFCs. The so - called Montreal Protocal is designed to achieve a 35% net reduction in worldwide CFC production by 1999.
That’s not good enough, however, the same stability that makes CFC so safe in industrial use makes them extremely longlives, some of the CFCs released today will still be in the atmosphere a century from now. Moreover, each atom of chlorine liberated form a CFC can break up as many as 100,000 molecules of ozone.
For this reason, governments should ensure the careful handling and recycling of the CFC now in use. When plastic-foam burger holders are broken, the CFCs trapped inside escape. Discarded refrigerators re- lease CFCs as well, and, a significant part of the U.S. contribution to CFC emissions comes from draining automobile air conditioners. Such release of CFCs could be prevented if consumers and businesses were offered cash incentives to return brokendown air conditioners and refrigerators to auto and appliance dealers. Then the units could be sent back to the manufacturers so that the CFCs could be reused.
While recycling will help, the only sure way to save the ozone is a complete ban on CFC manufacture, which should be phased out over the next five years. Fortunately, as the Montreal Protocal demonstrates, banning CFCs will be far simpler than reducing other dangerous gases. But a ban could admittedly be economically disruptive to the entire world: the annual market for CFCs is some $ 2.2 billion. The Soviet Union, which is a heavy user of CFCs, will have a particularly tough time phasing out the chemicals. "I agree with the ban in principle, "said Vladimir Sakharov, a member of the Soviet State Committee for Enviromental Protection, "but in practice it will be extremely difficult. Our economy is not flexible as others."
To make the transition easier, chemical companies are working hard to find practical substitutes for CF- Cs. The most promising approach so far is to use CFC family members that are chemically altered to make them less dangerous to the environment. The chlorine - free substitutes is the high cost of making them. It may be that until better manufacturing techniques are developed, consumers will have to pay more for affected products. The prospect is not a pleasant one, it is a small price to pay for curbing tile green house effect and saving the life -preserving ozone layer.
The best way to save ozone is ______.
选项
A、that CFC manufacture is completely forbidden
B、that the production of CFC is reduced
C、to find substitutes for CFCs
D、to reduce the danger of CFCs
答案
A
解析
这道题的也可以直接从原文的相关信息中获得,在本文的倒数第二段头一句就提到“while recycling will help,the only sure way to save the ozone is a complete ban on CFC manufacture”,因此应选择A。
转载请注明原文地址:https://kaotiyun.com/show/iuqO777K
0
专业英语八级
相关试题推荐
Publicdistrustofscientistsstemsinpartfromtheblurringofboundariesbetweenscienceandtechnology,betweendiscoveryan
Asapopularsayinggoes:"【C1】______"Goodhealthenablesoneto【C2】______andachievewhathe【C3】______.Withgoodhealthweca
Recentyearshavebroughtminority-ownedbusinessesintheUnitedStatesunprecedentedopportunitiesaswellasnewandsignific
Ingeneral,oursocietyisbecomingoneofgiantenterprisesdirectedbyabureaucraticmanagementinwhichmanbecomesasmall
A、AvacationtriptoYellowstonePark.B、Alecturebyavisitingprofessor.C、Herbiologythesis.D、Aresearchproject.D
A、Theabilitytobethetopstudents.B、Theabilitytogethighmarksinalltheexams.C、Theabilitytogetonwellwithpeople
IusedtoboastthatBritainwasarelativelyuncorruptsociety.LookatFrance,Iwouldsay,whereahighproportionofrecent
Whattodonow?SchoolofficialsaroundthecountryareaskingthatquestionfollowingaSupremeCourtdecisionrejectingracial
Whattodonow?SchoolofficialsaroundthecountryareaskingthatquestionfollowingaSupremeCourtdecisionrejectingracial
A、thespectatorsandofficialsB、thecarsC、thesportsstarsD、AlloftheaboveAA观众及官员们。因本次事故中—位自愿参加的官员遇难,因此争论的焦点在此。选A;B.汽车;C.体
随机试题
中年危机的表现。
患儿,男,11岁。跛行,有时跌跤已有10年,1岁时因“感冒”曾发热,体温38.6℃,伴头痛、肌肉酸痛,5天后热退,发现左足不主动屈伸。体格检查:左小腿肌肉萎缩,皮肤感觉正常,肌张力不高,胫前肌呈不完全性弛缓性瘫痪。进一步检查发现该患者胫前肌有收缩,但不
有关侏儒症的生化诊断的叙述,错误的是
天明公司与大地公司签订了皮衣买卖合同,并在合同中约定“如因皮衣买卖合同发生争议,由双方协商解决;协商不了的,请有关仲裁委员会仲裁”。后因送货地点发生争议,天明公司向其所在地的A仲裁委员会申请仲裁。但大地公司拒绝答辩。于是双方重新协商,签订了一份仲裁协议,约
下列哪些犯罪行为应按数罪并罚的原则处理?()(2003/2/36)
认为人都有侧隐之心、羞恶之心、恭敬之心、是非之心,这是()的观点。
试述我国在完善公务员管理中应遵循的原则。
E市开展一项公共政策的民意调查,随机抽取一千名市民回答有关问题。一个月后,再次随机抽取了一千名市民回答相同的问题,但问题的顺序设置与上次不同。结果发现,两次市民样本对许多问题得出了不同的回答。这证明同一组问题,因为其问题顺序的改变,有时就会得到不一样的回答
使爱情具有深刻的社会内涵,是爱情生长的内在依据的是()
Theconceptofpersonalchoiceinrelationtohealthbehaviorsisanimportantone.Anestimated90percentofallillnessmayb
最新回复
(
0
)