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    24．The Amazon valley is very important to the natural balance of the earth. Forty percent of the world’s oxygen there. A．produces B．has produced C．id produced D．has been produced 【查看更多】

     

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    The Amazon Valley is very important to the natural balance of the earth. Forty percent of the world’s oxygen ______ there.

    A. produces             B. is produced          C. has produced               D. has been produced

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    The Amazon valley is very important to the natural balance of the earth．Forty percent of the world’s oxygen     there．   

        A．produces       B．has produced      C．is produced      D．has been produced  

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    The Amazon valley is very important to the natural balance of the earth．Forty percent of the world’s oxygen　　　 there．

    　 A．produces　　　　　　　　 　　　 B．has produced

    　 C．has been produced　　　　　　　 D．is produced

     

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    Ｔhe Amazon valley is very important to the natural balance of the earth.Forty percent of the world’s oxygen 　　 there.　

    A.produces　　　 B.has produced　 C.is produced　　 D.has been produced

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