下列可以在交易所上市交易的（）
A.记账式国债
B.封闭式基金
C.可转换债券
D.短期融资券
参考答案：A, B, C
被除数是56，除数是7，商是（ ）。
If you don't know the answer to something, you say: "_______" [ ]
A. Sorry, I don't understand.
B. I'm sorry. I don't know.
C. Can you speak English?
D. Excuse me. How do you say that in English?
