A:煤是工业上获得芳香烃的重要来源
B:开发新能源,减少燃煤,是控制酸雨,保护环境的有效途径之一
C:煤、石油、水煤气均是可再生能源
D:煤的干馏和石油的裂解过程均属于化学变化过程
大多数动物在生态系统中和食物链中所处的地位主要是( )
A. She's my mother.
B. I have a happy family.
C. What's this?
D. This is my father.
Rose: ____
Tom: It's a picture (照片) of my family.
Rose: Who's this?
Tom: ____
Rose: Who's she?
Tom: ____ And this is me.
Rose: Are you happy?
Tom: Yes. ____