The movie once       a whole generation of people. They proved to be of much       in the education of people.

A．affected; effect

B．effected; affect

C．effected; effect

D．affected; affect

镁离子在DNA或RNA体外扩增反应的浓度一般为（）。

A.0.3～1mmol／L

B.0.5～1mmol／L

C.0.3～2mmol／L

D.0.5～2mmol／L

E.以上都可以