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    Every year on April 22，Earth Day is celebrated（慶祝）all over the world．It is a time to work towards keeping our earth clean．People plan projects to clean up the land，air and water．

    U．S．Senator Gaylord Nelson first thought of the idea for Earth Day in l962 when he saw polluted rivers and cities covered with smoke．Senator Nelson needed to get support from Americans to clean up the earth．Finally．on April 22，1970，20 million Americans celebrated the first Earth Day! Now many countries around the world celebrate it，and so can you．

How can you celebrate Earth Day? Here are a few ideas：

Join a clean一up project--Clean up your street or a favorite beach．

Save energy--Turn off the lights when you leave a room，and use public transportation．

Use less water．

Reduce（減少）／Reuse／Recycle-Practice the three Rs：First，reduce how much you  use．Then reuse or recycle what you can．

You can make a difference on Earth Day and every day!

1．When was the first Earth Day?

    A．On April 22，1970．                 B．On April 22，1962．

    C．On April 22，1771．                 D．On April 22 every year．

2． ___________ made Gaylord Nelson first think of the idea for Earth Day．

    A．The beautiful environment

    B．Projects to clean up the land

    C．Support from Americans

    D．Seeing polluted rivers and cities covered with smoke

3．How do people around the world celebrate Earth Day?

    A．By using more cars．

    B．By helping to clean up the land，air and water．

    C．By polluting rivers and cities．

    D．By taking fewer buses．

4．Which of the following sentences is NOT true?

    A．Americans celebrated the first Earth Day．

    B．Three Rs mean reduce，reuse and recycle．

    C．Now about 20 million people celebrate the Earth Day．

    D．People celebrate Earth Day by helping to do some public cleaning．

5．The best title of this passage is ________.

    A．Three Rs                            B．A Clean-up Project

    C．Celebrate Earth Day                     D．Save Energy