She’s been interested in computer science ____ she was eight.
A、before
B、since
C、ago

A.A、increase
B、increasing
C、increased

A.高效过滤器用于万级以上的洁净室、无菌病房、无菌灌装室、无菌动物房等净化空调
B.中效过滤器对微生物有很高的过滤效率
C.粗效过滤器用于新风过滤
D.中效过滤器用作高效过滤器的前级保护