硬膜外麻醉术中常见的并发症有（）
A.呼吸抑制
B.血压下降
C.心动徐缓
D.恶心呕吐
E.寒战反应
参考答案：A, B, C, D, E
免税债券的息票利率为5.6%，而应税债券为8%，都按面值出售。要使投资者对两种债券无偏好，税率(边际税率)应为( )。
A．30.0%
B．39.6%
C．41.7%
D．42.9%
---Jane wasn’t in when Jack came, was she?
---_____, but she returned a few minutes later.
A．No, she was
B．No, she wasn’t.
C．Yes, she was
D．Yes, she wasn’t.
