【正确答案】 B

【答案解析】[听力原文] 18-20
Thank you all for coming today to hear about the new recycling program on campus. Right now all recycling is voluntary, but in the near future it will most likely be mandatory. The recycling we have planned is really a 3-part program: sorting, collecting and distributing. Sorting is the hardest to get people to do. Most people don't like to take the time to separate their trash. And this is usually where most recycling programs fail. However, we are determined to make ours work. Instead of seeing the usual brown trash cans all over the campus, from now on you'll see four different colors of trash cans. Pink trash cans are for paper, green cans are for glass, maroon ones are for metal and white ones are for other wastes Just remember, pink: paper; green: glass; maroon: metal; white: waste. After the trash is sorted, they need to be collected and distributed to the correct recycling facilities. That's where all of you come in. Since this program's still a volunteer program, we are asking our students to give a little of their time to the project, probably no more than 6 hours per person each week. And again, your job is to collect the sorted trash and take it to different centers for each type of trash. If you are willing to help us with the program by giving 6 hours a week, please write your name and phone number on this note pad.

[解析] 本文的主要部分均在讲解回收项目的具体操作步骤，因此选B。