十二指肠水平段位于（）。

A.肠系膜上动脉前方

B.肠系膜上动脉后方

C.肠系膜上动脉上方

D.下腔静脉后方

E.腹腔动脉后方

—What do you think of the blind man?

—I've never seen a man with_________sense of touch．  

A．the better

B．a better

C．a good

D．the best