醋酸纤维薄膜电泳可把血清蛋白分成5条带，由负极数起它们的顺序是

A．γ、α₁、α₂、β、Alb

B．A₁b、β、α₁、α₂、γ

C．A₁b、α₁、α₂、β、γ

D．γ、β、α₂、α₁、A1b

E．α₁、α₂、β、γ、A₁b

At present, one of the arguments in favor of the new airport ________ that it will bring a lot jobs to the area.

A．is

B．are

C．will be

D．were