— Alice, what made you _____?

— My head teacher made a _____ remark about my new hair-style just as I came to the classroom. [ ]

A. annoyed; unsuitable

B. annoyed; pointed

C. annoying; cautious

D. annoying; diverse

2009年世界环境日的主题是“你的地球需要你--联合国际力量，应对气候变化”．空气中下列气体过多会影响气候、导致温室效应的是（　　）

A．N₂

B．H₂

C．CO

D．CO₂