引起杵状指的常见病不包括（）
A.胸膜炎
B.支气管扩张
C.发绀型先心病
D.肝硬化
E.慢性肺脓肿
参考答案：A
They are still very cautious about ______ side effect the new medicine will bring about, although the experts have tried it on about 2,000 patients.
A．which
B．that
C．where
D．what
[问题1] 请在下列选项中选择合适的答案，填入图3-1、图3-2的方框a和方框b。 B的公钥，B的私钥，摘要算法，A的私钥，A的公钥，会话密钥
