单项选择题
W: Hello, Mr. Jones. This is Betty Smith. M: Hello, Betty. W: May I speak to my husband M: John is in the lab now, Betty. I’ll tell him to call you at home.
A. In the lab. B. In the classroom. C. At home.
A. Places for Disposing Waste B. Waste Pollution Dangers C. Ways of Getting Rid of Waste D. Waste Disposal Problem
A. success B. interest C. prize D. skill