GNU的含义是（）。
A.GNU是UNIX
B.GNU不是UNIX
C.UNIX工程
D.GNU工程
参考答案：B
—Why didn't you come to Mike’s birthday party yesterday?
---Well, I ____, but I forgot it.
A．should
B．must
C．should have
D．must have
洋地黄慢性中毒最早出现的症状是
A．窦性心动过缓B．消化道功能障碍C．定向力丧失D．心脏传导阻滞E．色视障碍
