1. Why 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.

2. The underlined words “tipping points” most probably refer to “¡¡¡¡¡¡”.¡¡

A. freezing points¡¡¡¡¡¡¡¡¡¡¡¡B. burning points

C. melting points¡¡¡¡¡¡¡¡¡¡¡¡D. 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

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