13. (A)Taking a picture of Prof. Brown. 　　(B)Commenting on an oil-painting. 　　(C)Hosting a TV program. 　　(D)Staging a performance.

6. Parents today are more nervous about their kids’ safety than previous generations because________. 　　(A)there are now fewer children in the family 　　(B)the number of traffic accidents has been increasing 　　(C)their fear is amplified by media exposure of crime 　　(D)crime rates have been on the rise over the years