We must note that many people ____ the knowledge of first aid. [ ]

A. lack

B. lack of

C. lacking

D. are lacking

不符合流行性出血热临床表现的是：

A．心肌广泛出血坏死，心脏破裂猝死

B．三痛(头痛、腰痛和眼眶痛)

C．发热、低血压、休克

D．三红(颜面红、颈部红和胸部红)

E．急性肾功能衰竭