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    It still puzzles the science world why some mammals produce their you……【查看更多】

     

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    It still puzzles the science world why some mammals produce their young ______ and hatching while
    others _____ to young babies.     
    [     ]

    A. lying eggs; giving birth            
    B. by laying eggs; by giving birth  
    C. by laying eggs; give birth            
    D. laying eggs; giving birth

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    It still puzzles the science world why some mammals produce their young ______ and hatching while others _____ to young babies.

    　 A. lying eggs; giving birth　　　　　　 　　　B. by laying eggs; by giving birth

    C. by laying eggs; give birth　　　　　 　　　D. laying eggs; giving birth

     

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