We must apply what we have learned to our daily work because under no circumstances ________

from practice .

A. should theory separate

B. should theory be separated

C. theory should separate

D. theory should be separated

对有严重头痛和颈部强直的患者应立即进行哪项检查（）

A.检查末梢血

B.检查尿液

C.脑血管造影

D.CT和腰穿

E.检查眼底