受精的鸟卵在雌鸟体内开始发育,但产出后却停止发育,原因是(

受精的鸟卵在雌鸟体内开始发育,但产出后却停止发育,原因是( )。

A.外界湿度太低   B.外界有阳光   C.外界温度太低   D.外界有空气

答案

C

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