点A(a,4)与点B(﹣3,b)关于y轴对称,则a=□,b=□.( ) A.4 3 B.3 4 C.5 6 D.6 5 答案:B【考点】关于x轴、y轴对称的点的坐标. 【分析】利用关于y轴对称点的性质,横坐标互为相反数,纵坐标不变.即点P(x,y)关于y轴的对称点P′的坐标是(﹣x,y),进而得出答案. 【解答】解:∵点A(a,4)与点B(﹣3,b)关于y轴对称, ∴a=3,b=4, 故选:B. 【点评】此题主要考查了关于y轴对This tourist took lots of amazing close-up ________ (照片) of some of the world's most dangerous animals in a very special way.