－My family and I stayed at home watching TV this weekend. It's relaxing.

－______. But I think it's boring. [ ]

A. So we did

B. So did we

C. I agree with you

D. I like it

刚刚装修的房子由于材料中含有害物质甲醛（CH₂O）,一进门就会感觉刺眼，这是由于分子     使空气中充满了甲醛。为了减少危害，通常会在家中放置一些活性炭，这是利用活性炭的     ；甲醛具有可燃性，燃烧后生成水和二氧化碳，其燃烧的方程式为                      。