题目

Joey is fourteen. He has three sisters and no brothers. His father loves playing sports with him. Joey likes sports, but dancing is his favorite thing to do. Joey’s sisters go to dancing classes and Joey wants to go with them, too. His father doesn’t allow him to go. “Dancing is for girls,” says his father. Joey is not happy. He really wants to take the dancing classes. Joey’s sisters say they can help him. They secretly teach Joey to dance. On the day of the school dancing show, Joey dances with his sisters. Their father comes to school and he sees Joey’s dance. His fathe12．要得到函数y=sin2x的图象，只需将函数y=sin（2x-2）的图象上的所有点沿x轴（　　）A．向左平移1个单位长度B．向左平移2个单位长度C．向右平移1个单位长度D．向右平移2个单位长度