《MARPOL73/78》附则II中所指的B类物质是指如排放入海，将对海洋资源或人类健康造成（），因而有必要对之采取严格防污措施的物质。

A.较小危害

B.可察觉的危害

C.危害

D.重大危害

--- Do you have any problems _______ your maths?

--- No, I don’t. But I need some help _____ my English.

A．on, on

B．with, with

C．on, with

D．with, on