—Where is my umbrella? Must I take it with me, Mum ?

—It's fine today. You            take it with you. [ ]

A. can't

B. needn't

C. mustn't

急性多发性炎症性脱鞘性神经根神经病人常见的主要危险是（）.

A.四肢瘫痪

B.并发肺部感染、肺不张

C.并发心肌炎、心力衰竭

D.呼吸肌麻痹

E.合并消化道出血