It puzzles the scientists _____ some mammalsproduce their young _____ others lay eggs

下列对原文有关内容的分析和概括，不正确的一项是（ ）

_________________— I have a headache.

Is that your dog— No ,that’s Mary’s dog. The brown one is ______.

When television was first introduced, the extent _______ it would affect society could not have been foreseen.