For an answer, I checked with Tim Flannery, author of The Weather Makers:　 How Man Is Changing the Climate and What It Means for Life on Earth. In his book, he had challenged readers to make deep cuts in personal emissions to keep the world from reaching extremely important tipping points, such as the melting(融化) of the ice sheets in Greenland or West Antarctica. “To stay below that point, we need to reduce CO2 emissions by 80 percent, “ he said.

　　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.

　　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 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

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