Within a few years China ____ well have the most advanced railway industry in the world.

A．will

B．can

C．must

D．may

急性炎症性脱髓鞘性多发性神经病最常见的首发症状是（）

A.双下肢近端对称性弛缓性瘫痪

B.腱反射减弱或消失

C.肢体感觉异常

D.尿便潴留

E.直立性低血压