— I am going to New York this evening. Is there a flight to New York then?

— There ____ be a flight. But you'd better call the booking office to make sure. [ ]

A. must

B. may

C. would

D. will

兴奋通过神经-肌肉接头时，乙酰胆碱与受体结合使终板膜

A．对Na⁺通透性增加，发生超极化

B．对Na⁺通透性增加，发生去极化

C．对Ca²⁺通透性增加，发生超极化

D．对Ca²⁺通透性增加，发生去极化

E．对ACh通透性增加，发生超极化