[06:55.84]buy glass,wood or other natural materials instead of plastic.
[07:03.76]Scientists say
[07:06.84]that if each of us makes just one small effort like this every day
[07:14.73]we can make a substantial difference in the global warming trend.
[07:21.42]Part 4 Listening and Speaking 4.1 Understanding a Conversation
[07:32.60]2.Now listen to the conversation and,as you listen,
[07:39.70]choose the best an
