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; giv 题目和参考答案——青夏教育精英家教网—

题目内容

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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根据短文内容，将下列空白处补充完整，每空一词。
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