勃起功能障碍的病因应除外哪一项
A．心理性因素B．血管性因素C．内分泌性因素D．神经性因素E．以上答案都不对
参考答案：E
My ______sister who works in the bank is two years______than I.
A．younger,older
B．older, elder
C．elder, elder
D．elder, older
货币政策的传导机制
