Michael would like to travel _______ the world instead of staying _______ home during the winter holiday.

A．to; at

B．around; for

C．in; at

D．around; at

债券当期收益率的计算公式是( )。

A．票面收益/市场价格
B．票面收益/债券面值
C．(卖出价格-买入价格)/市场价格
D．(卖出价格-买入价格)/债券面值