It still puzzles today’s scientists some mammals produce their young others lay eggs to produce their offspringA．that; whileB．why; whileC．how; whenD．what; as 题目和参考答案——青夏教育精英家教网—

题目内容

It still puzzles today’s scientists ______ some mammals produce their young ______ others lay eggs to produce their offspring( 后代)

A．that; while

B．why; while

C．how; when

D．what; as

解析

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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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