Rolls-Royce is world famous for（）

A.Britain.s steel industry is declining.
B.No more new discoveries of iron ore have been found in Britain.
C.Supplies of iron ore are now mostly foreign.
D.Compared with newer plants in the world,Britain.s steelworks are not efficient.

A.Britain has used up almost all coal deposits
B.the demand for British coal has declined
C.petroleum,water power,and electric power are replacing coal for many purposes
D.the old British mines are narrow and deep,making it difficult to sue machines fro mining.

A.one-third
B.two-thirds
C.three-fifths
D.four-fifths