普通股票的功能有（）。
A．筹资功能
B．投资功能
C．投机功能
D．保值功能
参考答案：A, B
Jack, are you leaving now? It's 7:20.（）
A.Yes, it‘s still early.
B.No, thirty minutes is enough
C.Yes, the bag is not ready.
D.No, I‘ll set off in 30 minutes.
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