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    April 22 is Earth Day. Everyone on earth should care about and protect the earth! The earth has warmed by about 1 °F over the past 100 years, but why and how? Well, scientists are not quite sure. Maybe the earth gets warmer and warmer on its own. __60__   

       First, greenhouse effect (效应) is a very important reason for the change of the earth. People give out too much energy into the air every year. It makes the earth warmer. __61__Sometimes it becomes too hot and sometimes too cold. Sometimes there is too much rain and sometimes too little. The change of the climate makes the earth warmer. In turn, the warmth of the earth changes the climate, too.
        When the earth becomes warmer, there may be more rain and a rise in sea level. __62___ On a Pacific island, 100 people have to move to higher ground because the sea is rising. These people can no longer live on the coast. Before that, two islands without people went underwater in 1999. Scientists say that the seas can rise by nearly one metre by 2100.
        People can affect the earth's air, land and water. As for us, we can do many things to protect the earth. __63___ We can tell more people about protecting the earth.

    A.So it will affect the growth of plants, animals and people.

    B. But many scientists say that people are doing many things which make the earth warmer.

    C.For example, we can use fridges less.

    D. People in many cities turn off the lights for an hour on that day.

    E.Another important reason is climate change.

    BE A C

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