______ is important for all of us ___ English loudly in the morning.

A．It; to read

B．That; to read

C．It; reading

D．That; reading

下列哪一项不是慢性脊髓压迫症的临床特点（）

A.病情缓慢进展

B.肌张力减低

C.脑脊液蛋白增高

D.椎管内有阻塞现象

E.脊髓造影可证实