高二【英语(外研)】选择性必修二-Unit-6-Survival-(3)-ppt课件.pptx

选择性必修二 Unit 6 Survival(3)高二年级 英语Developing ideasPlan B:Life on Mars?ReadingObjectives At the end of the class,you will be able to:1.find out the reasons for humans to live on Mars2.make correct inferences and get the evidences3.retell the passage simply4.share opinions about Mars after learning the passageLead-in Talk about something about Mars.Mars is slightly more than half the size of Earth,with corresponding lower gravity.The atmosphere there is really thin,100 times thinner than on Earth and its not breathable.Its 96 percent carbon dioxide.Its really cold there and there is quite a range of temperature.A day on Mars is about as long as a day on Earth,plus about 39 minutes.Lead-in Talk about something about Mars.Seasons and years are twice as long as they are on Earth.Since the 1960s,Mars has been the subject of several unmanned exploration missions.However,many of early missions failed.Mars is a long way away,1000 times farther away from us than the moon.Lead-in Complete the quiz about Mars.1)Mars is the _ smallest planet in solar system.a.second b.third c.fourth2)The surface of Mars is covered in _.a.rocks b.water c.grass Lead-in 3)The average recorded temperature on Mars is_.a.40 b.2 c.-634)One day on Mars is about _ long.a.18 hours b.24 hours c.37 hours PredictingPredict the main idea according to the title and the pictures.Reading for general ideaRead the passage to answer the questions.1.Why do people make Plan B?2.What is Plan B?3.Is it easy for us to live on Mars?4.What should we do now?Checking the answers1.Why do people make Plan B?2.What is Plan B?Environmental problems have taken over as the greatest risk to life on Earth(paragraph 1).One option is to explore other planets to see if we could live on them.The most likely choice is Mars(paragraph 2).Checking the answers3.Is it easy for us to live on Mars?It is not easy because it would take months to reach Mars,travelling through dangerous solar radiation.Even if the first settlers do reach Mars safely,they may not be able to return to Earth.Staying alive will be a daily challenge(paragraph 4).Checking the answers4.What should we do now?We need to take much better care of our own planet until we are finally able to live on another planet(paragraph 5).SummaryFrom the prediction and the information above,we know that Plan B is to explore Mars to see if we might live on it one day.Reading for specific informationRead to find out the detailed information about the reasons why people might live on Mars.Reading for specific information1.Mars is relatively close to Earth.2.Mars has an environment less hostile than that of other planets.The possible answers:Reading for specific information3.Our interest in Martian exploration is greater than before.4.Since 1960s,we have been sending unmanned spacecraft to Mars.Our probes have orbited the planet,sending back valuable data and stunning images.Our robots have explored the Martian surface,testing the soil and searching for resources,water and signs of life.Reading for specific information5.Encouraged by discoveries over the years,space agencies of various countries are planning manned missions to Mars that could take place within the next 25 years.6.More recently,scientists have succeeded in growing a variety of plants in an environment similar to that on Mars.SummaryThe evidences that the natural geographical conditions of Mars and our interest,efforts and gain about Mars are clear to us that one day humans might live on Mars,which would be the most inspiring.Reading for specific informationChoose the magazine in which you would most likely find the passage and give your reasons.1.The Traveller2.All About Space3.Environmental Concerns4.Biology for FunReading for specific information1.The Traveller:focuses on the person who travels,what he sees,what he does or how he feels.The characteristic of each magazine:2.All About Space:focuses on the secret of the outer space,showing various fascinating natural phenomena.Reading for specific informationThe characteristic of each magazine:3.Environmental Concerns:focuses on various environmental problems,which usually draws peoples great concern.4.Biology for Fun:focuses on studies about life and living organisms for fun,including their physical structure and chemical processes.Reading for specific informationBy reading the passage,we know that today environmental problems have taken over as the greatest risk to life on Earth(paragraph 1).Scientific research shows that the planet Earth is getting warmer(paragraph 5).All the clues tell us the passage is most likely to be found in the magazine Environmental Concerns.Reading for specific informationChoose the magazine in which you would most likely find the passage and give your reasons.1.The Traveller2.All About Space3.Environmental Concerns4.Biology for FunChoose the statements that can be inferred from the passage.Reading for specific information1.Humans have yet not visited Mars.2.People want to go to Mars on holiday.3.There are plants growing on Mars.Reading for specific information4.The greatest risk to life on Earth used to be nuclear missiles.5.One day,humans will have to go and live on another planet.6.Our Plan A includes developing renewable energy resources.7.The Biosphere 2 experiment ended in failure.Reading for specific informationWhat is the inferred information?Inferred information refers to the opinions or conclusions that are not directly stated within the given information.Instead,the context,the headings and pictures often help us make educated guesses about a text.Reading for specific informationClues:Space agencies of various countries are planning manned missions to Mars that could take place within the next 25 years(paragraph 2).So number 1“Humans have yet not visited Mars”can be inferred.Reading for specific informationIn the 1960s and 1970s,the greatest fear was that the human race,and possibly all advanced life forms on the planet,could be wiped out by nuclear missiles,just at the push of a button(paragraph 1).So number 4“The greatest risk to life on Earth used to be nuclear missiles”can be inferred.Reading for specific informationScientists are thinking of ways to lower this risk,such as replacing coal and oil with forms of renewable energy(paragraph 1).So number 6“Our Plan A includes developing renewable energy resources”can be inferred.Reading for specific informationAs early as the 1980s,scientists were building Biosphere 2 in the Arizona desert.Although the two-year experiment was not a success(paragraph 4).So number 7“The Biosphere 2 experiment ended in failure”can be inferred.Retell the text according to the clues of why humans might live on Mars.You can add more information from the passage if necessary.Retelling Think about the following questions and share your opinions.1)Which is better,to live on Mars or to solve Earths problems?2)Would you like to be one of the first people to live on Mars?Why or why not?Thinking and SharingIn my opinion,to solve Earths problems is better.On the one hand,right now,its the only one we have.On the other hand,the Earths change is being caused by human activity and is having a terrible effect on the biosphere,so its our duty to protect it and solve the problems.Thinking and Sharing1)Which is better,to live on Mars or to solve Earths problems?I would like to be one of the first people to live on Mars,which is a great challenge for me.I am willing to explore better and more suitable place for our humans.Thinking and Sharing2)Would you like to be one of the first people to live on Mars?Why or why not?The passage mainly tells us that the planet Earth is getting warmer and warmer,and now our environmental problems have taken over as the greatest risk to life on Earth.Exploring Mars is the most likely choice due to its natural geographical conditions.Although we have been making efforts,for now,human settlement of Mars is still decades away.We need to take much better care of the planet Earth.We also need to make greater efforts to realize our dream.SummaryHomework1.Read the passage again and retell the passage.2.Write a summary of the passage and summarize the new words and language points you have learned,and then add them to your lapbook.