I can't remember when exactly _____ Robinsons left city, I only remember it was _____ Monday. [ ]

A. the; the

B. a; the

C. a; a

D. the; a

基本呼吸节律产生于

A．脊髓

B．延髓

C．脑桥

D．间脑

E．大脑皮质