Good advice, I thought. I'd opened our bedroom windows to let in the wind. We'd gotten so used to keeping our air-conditioning going around the clock. I'd almost forgotten the windows even opened. We should not let this happen again. It's time for us to change our habits if necessary.

　　68. Why did the author and his wife try a new diet?

　　A. To take special kinds of food

　　B. To improve their health

　　C. To lose weight

　　D. To respond to climate change. 69. The underlined words "tipping points" most probably refer to ________.

　　melting points

　　B. burning points

　　C. freezing points

　　D. boiling points 70. It can be inferred from the passage that ________.

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

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

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

　　D. it seems possible for every household to cut emissions of CO2 71. Which of the following would be the best title for this passage?

　　Changing Climate Sounds Reasonable

　　B. Changing Our Habits Begins at Work

　　C. Saving Energy Starts at Home

　　D. Reducing Emissions of CO2 Proves Difficult

　　【参考答案】 68---71

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