粒级煤是煤炭的一个品种。
参考答案:对
— 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