The underlined words “tipping points” most probably refer to _____

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• 1Why did the author and his wife try a new diet、

  A.To take special kinds of food

  B.To respond to climate change.

  C.To lose weight

  D.To improve their health

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• 2The author presents this passage by_____.

  A.telling an interesting story

  B.describing an activity in a lively way

  C.testing an idea by reasoning

  D.introducing a practical method

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• 3The passage would probably be most helpful to_____ .

  A.those who draw maps

  B.those who get lost

  C.those who make compasses

  D.those who do experiments

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• 4To find the direction, we ought to be patient probably because _____

  A.it is not easy to find a proper stick

  B.it is not easy to position the stick

  C.it takes hours to make the marks

  D.it takes about half an hour to make the marks

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• 5The ad is mainly intended to _____.

  A.encourage the British to travel in China

  B.attract the British to traditional Chinese food

  C.offer service of booking air tickets to tourists

  D.provide the British with a better understanding of China.

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• 6It can be inferred from the passage that_____

  A.it is necessary to keep the air-conditioning on all the time

  B.it seems possible for every household to cut emissions of CO2

  C.the average US household produces about 3,000 pounds of CO2 a month

  D.the average European household produces about 1,000 pounds of CO2 a month

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• 7Which of the following would be the best title for the passage、

  A.Saving Energy Starts at Home

  B.Changing Our Habits Begins at Work

  C.Changing Climate Sounds Reasonable

  D.Reading Emissions of Proves CO2 Difficult

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