The classroom is big enough ______, but we’ll have to move if we have more students.

A．for the moment

B．on the moment

C．in a moment

D．for a moment

生用活血通经，利水通淋，引血下行，制用补肝肾，强筋骨的药物是( )

A．五灵脂
B．牛膝
C．骨碎补
D．丹参
E．鸡血藤