口语运用。 从方框中选出最佳选项完成下面的对话。
Tony: Hi, Lucy. I haven’t seen you these days.   
Lucy: I joined an environment protecting club. We went to all the parks in our city to collect rubbish these days.
Tony: Can I join the club to protect the environment?
Lucy: Of course you can. We can also protect the environment by ourselves.
Tony: What should I do?
Lucy:   We should put the rubbish in the dustbin.
Tony: What else should I do?
Lucy: Second, we can plant trees.   
Tony: That sounds easy.
Lucy:   

A. Where have you been? B. First, we shouldn’t leave rubbish here and there. C. What a wonderful experience! D. Trees can stop the wind from blowing the earth away. E. Easier said than done.