Unit4 Globalwarming
suggested answers：(1)global warming/the warming of the earth.(2)sophie armstrong，earth care.(3)dr janice foster，charles keeling，george hambley.they don't agree with each other.2.detailed reading(1)read the passage carefully and judge whether the statements are true(t) or false(f).①janice foster believes that global warming is caused by the burning fossil fuels.( )②natural gas is a greenhouse gas.( )③carbon dioxide is a byproduct of burning fossil fuels.( )④people accept charles keeling's data because he took accurate measurements.( )⑤flooding could be one of the effects of future global warming.( )⑥george hambley believes scientists are just guessing about the effects of global warming.( )⑦george hambley is worried about the effects of carbon dioxide on plant growth.( )⑧it is clear what the effects of global warming will be.( )(suggested answers：tfttttff)3.structure analyzing ask students to read the text carefully and try to find out how many parts they can divide the text into and find out the main idea of each part.part
main idea
part 1(paragraph ______)
part 2(paragraphs ______ to ______)
part 3(paragraphs ______ to ______)
part 4(paragraph ______)
suggested answer：
part
main idea
part 1(paragraph 1)
to introduce a debate over the issue of global warming.
part 2(paragraphs 2 to 5)
to illustrate how global warming comes about.
part 3(paragraph 6)
to list two different attitudes among scientists towards global warming.
part 4(paragraph 7)
it's up to readers to think and decide whether people should do something about global warming or not.step 4 language studydealing with any language problem if any(words or sentences students might not understand)to help the students to have a better understanding of the text.step 5 listening，reading aloud and underlining ask students to read the passage aloud to the tape and let them pay attention to the pronunciation of each word and the pauses within each sentence.tell them to pick out all the useful expressions or collocations from the passage while reading and copy them to the notebook after class as homework.collocations：come about，there is no doubt that...，subscribe to，due to，greenhouse effect，quantities of，tend to，be trapped in，go up，result in，on the one hand...on the other hand，be opposed to，build up，keep on.step 6 retelling ask students to talk about global warming in their own words.give them some key words and expressions on the blackboard.then let them try to retell the passage.