新视野大学英语3听力原文unit7.pdf
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1、M:Now we have satellites and high-powered microscopes,its easy to think we know everythingabout the world;but we still dont understand El Nino.W:Right.Scientists all over the world are even uncertain about the cause of the warm Pacificcurrent that brings storms or drought the mysterious El Nino.Q:Wh
2、ich of the following is true according to the conversation?M:Everyone is talking about environmental problems:acid rain,the greenhouse effect,holes inthe ozone layer.We should think positively.What can we do to improve things?W:I agree.We could do a lot more to harness the suns energy for heating an
3、d lighting in ourhomes.In Japan 43,000 solar roofs were installed in 2002.Q:How do the man and the woman view the environment?W:We lived in Beijing some years ago.It was always difficult to keep the house clean with thewind from the north blowing sand from the desert at us.M:Thats why the Chinese go
4、vernment has been encouraging people to plant trees along the edgesof the Gobi Desert.Now those trees act as wind barriers.Q:What did the government encourage people to do?M:Many old refrigerators and cars are environmental hazards because they contain CFCs thatdestroy the ozone layer.W:Yes,but gove
5、rnment organizations are helping people to safely dispose of old refrigerators or,in the case of cars,to upgrade their air conditioning.Q:What are government departments helping people to do?M:Hey,that*s an aerosol spray youre using on your hair!Build a bomb or set fire to the apartmentto kill us qu
6、ickly instead of making holes in the ozone,so we die of cancer.W:Cool it,man.This spray doesnt contain CFCs.And youd better read a little more.In 2003 thehole in the ozone layer shrank by 20 percent,so theres no reason to panic.Q:What does the man mean?1We should have proper respect for nature!Marth
7、a:Do you think most people in your culture respect nature?Ed:I think so.Umm.more now than before.Martha:What do you think is the most serious environmental problem in the world today?Ed:Today.I think damage to the ozone layer is a big problem;and another problem is pollutionin big cities and things
8、like that.Martha:How do you learn about environmental problems?Ed:Umm.through school.A lot of clubs promote environmental safety,and some TV programs,too.They talk about environmental safety and stuff like that.Martha:Do you think students should learn more about the environment at school?Ed:I think
9、 so.So,as they grow older,they can be more aware of all the problems that are goingon.And also to prevent more problems from occurring.Martha:If you could create a new law to help the environment,what would it be?Ed:A new law for the environment?Umm.Fd probably say that when people throw away theirc
10、igarette butts,they have to throw them into the garbage bin,not just throw them everywherebecause its just littering and I hate that.So they should be fined if they throw them on the floor oron the ground.Martha:Thats a good idea.What do you personally do to help protect the environment?Ed:Fm so aga
11、inst littering.I never litter.If I see somebody litter,I get really angry.So I alwaysthrow my trash into the garbage bin.,The Smaller Hole in the Ozone LayerAccording to a report by Australian researchers,the hole in the ozone layer over Antarctica willprobably start closing within five years.They s
12、ay it may be completely closed within fifty years.The ozone layer protects the Earth from dangerous radiation from the sun.The hole in the ozonelayer was discovered over Antarctica almost thirty years ago.At the time,it was three times thesize of Australia.The report found that ozone-destroying gase
13、s in the upper atmosphere were at or near their highestlevels in the year 2000.But since then,there has been continuous progress made toward therecovery of the ozone layer.Satellite information showed that levels of ozone-destroying gases inthe atmosphere are slowly decreasing.At its largest this ye
14、ar,the ozone hole covered more than 15million square kilometers.That is down from a yearly average of 23 million square kilometersover the last six years.Chlorofluorocarbons,or CFCs,are responsible for destroying part of the ozone layer overAntarctica.CFCs have been widely used since the 1930s in co
15、oling devices such as refrigeratorsand air conditioners.CFCs remain in the atmosphere for years.Government scientists say the level of chlorine in the atmosphere is decreasing because ofrestrictions on the use of chlorofluorocarbons.The chemicals were restricted under aninternational agreement calle
16、d the Montreal Protocol in 1987.Under the Protocol,developingcountries promised to cut their use of chlorofluorocarbons in half by the year 2005.They alsoagreed to an eighty-five percent cut by the year 2007.nA Mild El NinoThe El Nino weather condition has returned.However,officials at the United St
17、ates NationalWeather Service say El Nino is weaker than usual this year.El Nino is a change in the atmosphereover the Pacific Ocean.It happens every four to five years.Normally,water temperatures in the western Pacific Ocean increase near the end of the year.Thiscauses more rainfall in Indonesia,Aus
18、tralia and other nearby places.At the same time,cold oceanwater causes less rainfall in the eastern Pacific Ocean,near South America.The opposite happensduring El Nino.Pacific Ocean temperatures increase near South America,causing unusually highamounts of rainfall there.In contrast,El Nino causes dr
19、y weather in Indonesia and Australia.A strong El Nino can severely affect the weather all over the world.The last powerful El Nino wasin 1997 and 1998.It caused major floods in many places.El Nino also led to extremely dryweather in some other areas.Reports say the weather caused the deaths of about
20、 24,000 people.So experts say having a weaker El Nino this year is good news.Meteorologists say rainfall hasbeen higher than usual in South America.The experts say the effects of El Nino will begin to showin November in the United States.The northern states may have a warmer winter.But,scientistssay
21、 El Nino will not be strong enough to prevent this years powerful storms in the AtlanticOcean.The Environment and the DevelopmentLi:Hi,Professor Wang,Fm Li Lin,a correspondent from the University Newspaper.The staff andstudents here are getting more and more interested in the relationship between th
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