— Mom, can you give me an extra 200 yuan a month?

— Son, we have just bought a house, and from now on we need to practice strict ______.

A．economy

B．medicine

C．self-control

D．patience

在日本发行的武士债券是（）。

A．本国债券

B．外国债券

C．欧洲债券

D．全球债券