题目

从下面方框中选择正确的选项，补全对话，其中有两项是多余的。 A: Hi, Jane. Would you like to help save the environment? B: I’d like to.   1    A: Well, first, you can start by turning off the lights when you leave a room.B: Yes. That’s easy.   2   What’s next?  A: Second, you can ride a bicycle. Don’t take a bus or a taxi if you don’t have to. B:   3   What else?  A: Third, try to recycle paper.  B: Mmm. Newspapers, magazines, we have a lot of paper at home. Good idea. A: The fourth idea is to turn off the shower when you’re not using以下属于纯净物的是（　　）A．胆矾B．粗盐C．汽水D．空气