投资者进行回购交易时，因代理而产生的风险应( )。A．由投资者本人承担 B．由证券

----Hi! Where are you going? See what the sign _________ ?

----Sorry, I _________ it.

A．speaks, don’t notice

B．writes, didn’t notice

C．says, didn’t notice

D．says, haven’t noticed

You should have a _____ lifestyle, or you can’t be in good _____. [ ]

A. health, health  

B. health, healthy  

C. healthy, health

D. Healthy, healthy

重载运煤专线线路可采用（）钢轨轨道结构。

A、60kg/m

B、65kg/m

C、70kg/m

D、75kg/m

参保职工在独生子女假休假期间可享受生育津贴待遇吗？

留置权的概念和成立要件。