题目

--What the score yesterday? --It80:82. A. was, wasB. is, isC. are, are D. were, were 答案：A为了得到y=sin2x的图象，可以将y=cos2x的图象（　　）A．向左平移π2个单位B．向左平移π4个单位C．向右平移π2个单位D．向右平移π4个单位