与乳腺癌发病无关的是
A．雌酮和雌二醇B．月经初潮年龄早C．绝经年龄晚D．一级亲属中有乳腺癌病史者E．吸烟
参考答案：E
Which of the following is forbidden in a Direct Method classroom
A. Using gestures. B. Sketch drawing.C. The first language. D. Writing.
交叉式结构有哪几种表现形式？
