D. To improve their health.
2. The underlined words “tipping points” most probably refer to “ ”.
A. freezing pointsB. burning points
C. melting pointsD. boiling points
3. It 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
4. Which of the following would be the best title for this passage?
A. Saving Energy Starts at Home
B. Changing Our Habits Begins at Work
C. Changing Climate Sounds Reasonable
D. Reducing Emissions of CO2 Proves Difficult
【参考答案】1-4 BCBA
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