关于老年人高血压病的特点，下列哪项不符合
A．脉压小
B．主要表现为单纯收缩期高血压
C．容易发生心功能不全
D．压力感受器调节血压敏感性减退
参考答案：A
To tell the truth, if it were not for the fact that you______ my daughter, I would not take such pains to serve you.
A．were
B．are
C．had been
D．have been
Km值是指反应速度为Vmax时的（）
A.酶浓度
B.产物浓度
C.底物浓度
D.激活剂浓度
E.抑制剂浓度
