There is still a ___________ doubt among them as to the practical value of the building.    [ ]

A. specific  

B. sure    

C. some   

D. certain

母亲怀孕早期哪些因素与先天性非遗传性聋有关()

A．外伤

B．患风疹

C．营养不良

D．患流感

E．大量应用耳毒性药物