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    The rise in temperature is a result of the greenhouse effect (温室效应). And it helps keep the earth warm enough for people， plants and animals to live on. There are some natural gases like CO2 around the earth. These gases create (产生) something like a blanket around us. The blanket lets in the heat (热量) of the sun and keeps it near the ground. It is like how a real greenhouse works.

    It is important to understand the greenhouse effect. Some of the things we do every day can change the temperature of our earth. If factories， cars， and other things are making lots of new waste gases， the earth will get warmer. In the end， it will become too hot for us to live on.

    1. The underlined word “it” in the passage means _______.

    A. the temperature of the earth

    B. what many scientists think

    C. the greenhouse effect

    D. the gas around the earth

    2. The blanket around us is made up of _______.

    A. wood B. plants C. gases D. sunlight

    3.Which is the best title for the picture?

    A. How a Greenhouse Works

    B. Planting Flowers in a Greenhouse

    C. Why the Heat Gets Trapped

    D. The Importance of the Sun

    4.Where is the passage probably taken from?

    A. A weather report. B. A fashion magazine.

    C. A doctor’s diary. D. An environmental article.

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