无降压作用的是
A．黄连B．栀子C．知母D．黄芩E．牛黄
参考答案：C
What's your favourite weather? [ ]
A. It's sunny.
B. It's wind.
C. It's summer.
凭证式国债是一种可上市流通的储蓄型债券，主要由银行承销。（）
