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    4．A．The population of Asia is over three billion.

           B．There are more people in Asia now.

            C．Asia has three billion people.

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    3．A．People can recycle some waste things.

            B．People need many new things every day.

           C．People are wasting things now.

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    2．A．countries              B．continents            C．contact

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    1．A．2009               B．2019              C．2090

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