—Have you brought        with you? We won’t have time to come back.

—Don’t worry. All the things we need are here, in this big bag.

A．something

B．anything

C．nothing

D．everything

提出经典的条件反射学说的学者为（）

A.华生

B.贝克

C.巴甫洛夫

D.斯金纳

E.沃尔普