单项选择题
A.prepare B.preparing C.prepared D.to prepare
A.The dye is often produced in Sudan. B.The dye has something to do with the country named Sudan. C.Nobody is sure of the origin of the name. D.Many foods produced in Sudan contain the dye.
A.Man could stand on two feet. B.Man’s brain became big enough. C.Man’s arms became strong. D.Man could use the stone tools.