包含嵌入式期权的债券包括（）。
A.可转换债券
B.可赎回债券
C.零息债券
D.可卖回债券
E.通货膨胀指数化债券
参考答案：A, B, D
One of the great things about science is that it has taught us to be __________ about surface appearances. The world seems flat, but it is, in fact, round.
A．accurate
B．creative
C．consistent
D．skeptical
索引的作用是什么分为哪几种类型视图有哪些作用它能为用户提供哪些方便
