下列指数中用于判断口腔卫生状况的是
A．牙龈指数
B．菌斑指数
C．龈沟出血指数
D．探诊出血
E．牙周指数
参考答案：B
The manager was worried about the press conference his assistant ________ in his place but，luckily， everything was going on smoothly.[ ]
A．gave
B．gives
C．was giving
D．had given
β受体阻滞剂作为降压药的禁忌症有（）
A.心动过缓
B.心动过快
C.病态窦房结综合征
D.外周血管病
E.房室传导阻滞
