─Shall we go shopping together this afternoon?
─ ____ .My mother will take me to see my grandparents.
A:That sounds great!
B:Yes,I'd like to.
C:OK,see you!
D:Sorry,I can't.
烟草燃烧后产生的烟雾中明显有害的物质有____ 、一氧化碳、烟焦油等,吸烟对肺的健康危害极大.联合国已将每年的 ____ 定为“世界无烟日”.