---Perhaps we can’t arrive at the bus station on time．

---               ．We still have forty minutes．

A．Yes, you are right

B．Not at all

C．What a pity

D．Take it easy

脱疽（营养障碍期）出现的典型症状是（）

A.发凉

B.间歇性跛行

C.麻木

D.静息痛

E.坏疽