All the travelling fare, unless specifically stated _________, includes admission charges to the attractions, shows and exhibitions we visit.

A．otherwise

B．likewise

C．therefore

D．still

鉴定病毒血清型常用的方法是（）

A.耐酸实验

B.脂溶剂敏感试验

C.胰蛋白酶敏感试验

D.中和试验