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    If the sun’s rays were entirely _______, there would be dramatic changes in the climate on the earth, and the result could be disastrous to the human race.    
    [     ]
    A. covered out   
    B. broken out    
    C. blocked out    
    D. left out

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    If the sun’s rays were entirely _______, there would be dramatic changes in the climate on the earth, and the result could be disastrous to the human race.

    　 A. covered out　 　　B. broken out　 　　 C. blocked out　 　　D. left out

     

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