One advantage of fishing is ______ it can give you a lot of pleasure.

A．how

B．why

C．that

D．when

下述哪项不是烧伤的现场急救原则（）.

A.迅速脱离致伤源

B.立即冷疗

C.就近急救

D.分类转送专科医院

E.立即镇静补液