----Go for a picnic this weekend, OK?

---- ______. I love getting close to nature.

A．I couldn’t agree more

B．I afraid not.

C．I believe not

D．I don’t think so.

镇痛作用与脑内阿片受体无关的药物是（）

A.曲马朵

B.罗通定

C.哌替啶

D.吗啡

E.纳洛酮