The medicine ___ as soon as you take it. But it ____ the blood.

A．brings into effect; effects

B．takes effect; has a bad effect on

C．comes into effect; has little effect on

D．is carried into effect; has much effect on

胸部X线透视检查主要应用X线的特性是（）

A.穿透性

B.荧光效应

C.感光效应

D.电离效应

E.生物效应