I still remember the morning. My father suddenly wake me up at about 5 and the sky was still gray. I jumped out bed surprised and extreme happy, for we were going to get a book! When we drove to the bookstore, many people were already waiting there. We waited for our turn at about 8:30. I was overjoyed when I got a book, not only because of the book themselves, but also of the love from my father. Never before had I felt such a love from him, because of my father, I believed then, had always been busy with his own work. That was “Harry Potter” that helped I feel the deep love from my parents!

煤的气化所得气体可用于城市家用燃气。下列选项中的气体均属于家用燃气有效成分的是[ ]

A.CO、H₂、N₂

B.CO、CH₄、H₂

C.CO、CH₄、CO₂

D.CH₄、H₂、O₂