根据内容，选择相应的职业

__小题1:__ I work with people and money. People give me their money or get their money from me. I work in a bank.

__小题2:__ I like talking to people. I meet interesting people every day and ask them questions. I have an office in the TV station.

__小题3:__ I wear a white uniform and I help doctors. Sometimes I work in the day and sometimes at night.

_小题4:_ I can speak English and Chinese. I always stay with children and help them.

___小题5:__ I study hard. I learn English, Chinese, math and other subjects. My classmates are very helpful and they often help me. I like my school.

下列国际货币市场工具中信用风险最低的是( )。

A．国库券

B．回购协议

C．欧洲票据

D．大额可转让存单