甲醇萃取塔内物料的相态，正确的是（）。
A、碳四和水均为液态
B、碳四是液态，水是气态
C、碳四是气态，水是液态
D、碳四和水均为气态
参考答案：A
—Excuse me, do you have English dictionary?
—Yes, I do.
A．a
B．an
C．the
D．/
34. --- I think I’ll give Bob a ring.
--- You _______. You haven’t been in touch with him for ages.
A．will
B．may
C．have to
D．should
