1、Unit 4Section Step 1Step 2Step 3Step 4Step 5Do you know what effects global warming have on penguins?What can we do to reduce global warming to protect them?Please read the following passage to get the answer.Antarctica,the coldest place on Earth,is too cold for most humans.Its a different story for
2、 penguins,though.Several types of penguins make their home in Antarctica.The birds walk with short steps all over the icy continent.However,they dont all have“happy feet”.Some of Antarcticas penguins are endangered.The animals hunt for food in waters off Antarcticas coasts.They use floating sea ice
3、as a place to rest while they search.In recent years,global warming,the slow rise of Earths temperature,has been causing the ice to melt.“Global warming is reducing the amount of food for penguins so that they cant find enough to eat，”scientist Shaye Wolf said.Turning up the heat Humans may be direc
4、tly responsible for the continents temperature changes,according to a new study in the journal Nature Geoscience.Temperatures in Antarctica usually do not go above freezing,or 32 degrees Fahrenheit.But lately the weather has been heating up.People add to global warming when they drive cars or use el
5、ectricity.That burns fossil fuels,such as coal,oil,and natural gas.The burning of fossil fuels gives off gases that warm Earth.The harmful gases stay in the atmosphere above Antarctica,researchers say.They found that the west side of the continent is especially affected by global warming.Scientists
6、are concerned about the possibility that Antarcticas ice may melt more over time.The icy continent is about 5 million square miles.It is covered by glaciers and an ice cap(冰冠)about 7,100 feet thick.If the ice melts,that could cause sea levels to rise around the world.Higher sea levels could lead to
7、dangerous flooding in some countries.Cool fix for Antarctica Experts are hopeful that conditions in Antarctica can be improved.They say people can reduce global warming by using cars and electricity less often.Even kids can help.Wolf suggests,“Talk to your friends and family about global warming,how
8、 it is harming penguins,and how important it is to stop global warming today.”.Look at the pictures and answer the question.What can you learn from the above four pictures?_答案：The earth is becoming warmer and warmer.Which of the following can cause global warming?_答案：ACDE.Skim the text and sum up th
9、e main idea of each paragraph.Para.1Athe cause of the earths becoming warmer Para.2 Bthe consequence of burning fossil fuels Para.3 Cthe increase of carbon dioxide Para.4 Dglobal warming will go on Para.5 Epuzzles about global warmingPara.6 Fdifferent attitudes to global warmingPara.7 Gan introducti
10、on to the passage 答案：Para.1：G；Para.2：A；Para.3：B；Para.4：C；Para.5：D；Para.6：F；Para.7：E.Scan the text and then choose the best answer.1What is mainly discussed in the text?ACarbon dioxideBWater vaporCGases in the atmosphere DTemperature increase2George Hambley thinks that more carbon dioxide_.Amay lead
11、to catastropheBwill do good rather than harm to the earthCwill cause the spread of diseasesDwill encourage a great range of animals,thus threatening human beings3What is the purpose of the last paragraph?ATo make readers disappointed with the problem.BTo make readers think about the problem.CTo show
12、 the authors opinion on the problem.DTo begin some discussion about the future.4What will happen if we do nothing about global warming?AIt would cause the sea level to rise,storms,droughts,famines and so on.BThe temperature will be surely lower.CIt doesnt matter.DIt has nothing to do with us.答案：14DB
13、BA.Read the text carefully and write down the main idea of the text.The passage puts forward different points of view about the effect of increased(1)_in the atmosphere，the(2)_of the earths increased temperature and the possible effects.答案：(1)carbon dioxide(2)cause.Read the text carefully and fill i
14、n the blanks.答案：1.fossil fuels2.315 parts3.1004.sea level5droughts6.diseases7.disappearance8.quicker9more10.animalsFill in the blanks according to the text.There is no 1._that the earth is becoming warmer no matter whether it is a natural 2._.Scientists believe that“greenhouse effect”begins when we
15、add huge 3._extra carbon dioxide into the atmosphere by burning 4._.The increased amount of carbon dioxide is causing the global temperature to 5._.Scientists also agree that it is the burning of more and more fossil fuels that has resulted in this increase in carbon dioxide.On the one hand，Dr Foste
16、r thinks that an increase of five degrees would be a 6._.Scientists cant predict the climate well enough to know what to expect.On the other hand，a scientist，George Hambley predicts that any warming will be mild with few bad environmental 7._.He 8._that more carbon dioxide will encourage a greater 9
17、._of animals all of which will make life for human beings better.However,greenhouse gases continue to 10._in the atmosphere and the climate is going to keep on warming.答案：1.doubt2.phenomenon3.quantities of4.fuels5go up6.catastrophe7.consequences8.states9range10.build upWhat will global warming bring to us in your opinion?_答案：The side effects of global warming are alarming.A warmer global climate melts the ice caps,raising sea levels.What is more,it disturbs weather,causing droughts，severe storms,hurricanes.People suffer a lot from disasters relevant to global warming.
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