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III. 课文内容填空(共5分,每空0.5分)

Finally about 2.6 million years ago some small clever animals now with hands and feet, appeared and 1___________ all over the earth. Thus they have, in their 2________, become the most important animals on the planet. But they are not looking after the earth very well. They are putting too much carbon dioxide into the 3_____________, which 4______________ heat from 5_______________ from the earth into space. As a result of this, many 6_________ believe the earth 7________ become too hot to live on. So 8________ life will continue on the earth for millions of years to come will 9_______ on whether this problem can be 10_______.

1.spread   2.turn   3.atmosphere   4.prevents    5.escaping   6.scientists   7.may   8.whether    9.depend   10.solved  

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