单项选择题
John bought a $100 DVD player on sale at 8% off. How much did he pay including 8% sales tax（）
A. $84.64 B. $92.00 C. $96.48 D. $99.36 E. $100.00
单项选择题 If x+y=16, and if x2-y2=48, then x -y=（）
单项选择题 In the series N1 , N2, N3 , N1=-1, and Nx+1=-1 Nx+x].（）
单项选择题 （）
