—Don't you know that a proper amount of exercise a day will ________ to a person's health?

—No wonder  so many senior citizens do exercise in the square.

A．construct

B．conclude

C．distribute

D．contribute

IVP的简称是（）

A.腹部平片

B.逆行性肾盂造影

C.静脉性尿路造影

D.膀胱造影

E. * * 造影