目前沪深证券交易所国债回购交易报价不采用( )。

A．年收益率

B．国债面值

C．百元面值国债到期回购价

D．回购期资金的利息收入

What does the passage mainly discuss

A．( The role of instinct in animal behavior

B．( Observations that suggest consciousness in an anima behavior

C．( The use of food in studies of animal behavior

D．( Differences between the behavior of animals in their natural environments and in laboratory experiment