通过影响肾素-血管紧张素-醛固酮系统而发挥降低血压作用的药物是（）
A.利血平
B.哌唑嗪
C.甲基多巴
D.巯甲丙脯酸
E.肼苯哒嗪
参考答案：D
This is a very interesting book. I'll buy it, _____. [ ]
A. how much may it cost
B. no matter how it may cost
C. however much it may cost
D. how may it cost
龋病患病率最高的牙为
A．下颌第一恒磨牙B．上颌第一恒磨牙C．下颌第二恒磨牙D．上颌第二恒磨牙E．前磨牙
