I like your pet dog very much. But I can’t find _______ in the pet shop. Where did you buy _______?

A．it, it

B．it, one

C．one, one

D．one, it

孕激素类药物具有

A．抗炎作用

B．抗过敏作用

C．质疏松作用

D．保孕作用

E．引产作用