1、Unit 2 Saving the EarthTopic 2 All these problems are very serious.Section C 课件课件 1Review(1)_ of us knows how to stop the bad behaviour.(2)I knocked on the door but _ answered.(3)Some of these books are better than_.Fill in the blanks using something,anything,others,nobody,everyone,anybody,everywher
2、e,none,other.Nonenobodyothers(4)She was driving the car with one hand and wiping the window with the _.(5)They are beautiful but I am looking for _ useful.(6)Is there _ you can do to help her?othersomethinganything(7)Therere 5 000 people living here and almost _has his/her own car.(8)Hes cleverer th
3、an _ I know.(9)Ive looked _ but I cant find it.everyoneanybodyeverywhereWhat can we do to protect our environment?In our daily life,we should face more environmental problems.Can you say something about them?cities,pollute,health problems factories,the land and the air,deadIn our daily life,we shoul
4、d face more environmental problems.Can you say something about them?cut down,millions of,take away the earth,become desert拿走拿走In our daily life,we should face more environmental problems.Can you say something about them?oxygen a special kind of oxygen called“ozone”(O3)氧气氧气 a very big hole in the ozo
5、ne layer,too much harmful radiation from the sun臭氧层放射，放射物 n.洞，坑v.出现，形成n.种类，形式In our daily life,we should face more environmental problems.Can you say something about them?CO2 carbon dioxide increase a lot,form a“blanket”,the heat from the sun cant escape二氧化碳毛毯，毯子渗出；逃跑；逃脱 cause the level of the sea t
6、o rise called“the greenhouse effect”or“global warming”v.上升；起床；升起温室效应温室效应fewer treesfactory pollutiontraffic pollutionthe ozone layermore carbon dioxideCan you match them?Choose suitable titles for Paragraphs 2-6.Then write it down in front of each paragraph.A.Traffic pollution B.Factory pollution C.
7、Fewer trees D.The ozone hole E.More carbon dioxide The earth is 4.6 billion years old.We humans have lived on the earth for only 35 000 years,but during this period,we have changed our planet a lot in many ways.Some things weve done are very good for the earth while some are bad._ All over the world
8、,people have cut down millions of trees.When it rains or when the wind blows,the earth is taken away.Forests have become deserts,so many kinds of animals and plants are disappearing.Fewer Trees _ In big cities,cars and buses have polluted the air.Now many people in cities have health problems._Facto
9、ries have also polluted the land and the water.As a result,many rivers and lakes are now dead._ Around the earth,theres a special kind of oxygen called“ozone”(O3).It is important to the earth.But now air pollution is destroying it and making a very big hole in the ozone layer.Too much harmful radiat
10、ion from the sun passes through the hole and reaches the earth directly.This is very dangerous because this kind of radiation can cause cancer.Traffic PollutionFactory Pollution The Ozone Layer _ Carbon dioxide(CO2)in the air has increased a lot.It mainly comes from burning oil,coal and wood.This ha
11、s formed a blanket around the earth.The heat from the sun cant escape so the temperature is rising.This is called“the greenhouse effect”.It causes the level of the oceans to rise and the climate of the earth to change.All these problems are very serious,so we must do something now.More Carbon Dioxid
12、eProblemEffect on the environmentfewer trees forests become deserts,animals and plants disappeartraffic pollution greenhouse effect,level of oceans rising,climate changeRetell it cars and buses pollute air,health problemspollute land and water,rivers and lakes deadharmful radiation reaches the earth
13、,cause cancer factory pollution ozone hole more CO22 Surf the Internet to collect more information about environmental problems and effects.Then discuss the information in groups and take notes.3.Combine the key points in 1c and 2 to form a short passage and pay attention to the proper linking words
14、.As we all know,water pollution is becoming more and more serious.Some factories pour waste water into the rivers.As a result,it makes the water dirty and smell terrible.Most of fish in the water have died and we cant swim in the water.Water is very important to human beings,so we should do our best
15、 to protect and save it.Luckily,our government is taking measures to protect the water from pollution.You can write it like this:1.Some words:hole,form,rise 2.Some phrases:take away,refer to 3.Some sentences:All these problems are very serious,so wemust do something now.1.Talk about the harm of pollution.2.Combine the key points to form a short passage.1.Read 1a.2.Memorize the useful expressions and key words which we learn today.3.Finish Section C in your workbook.4.Review Section A-C and preview Section D.
