.Mr. Richard hasn’t got any time to play golf these days,because he is ______in the research of bird language.

A．devoted

B．concentrated

C．buried

D．spared

The GMDSS defines four sea area based on the（）.

A.location and capacity of the facilities located on board ships

B.Position and type of a sincere sintion

C.Capacity and location of shore based communication facilities

D.Position and capacity of mobile communication stations