单项选择题
A．About the 6th century. B．Before the 17th century. C．Before the 14th century. D．Before the 15th century.
A．Rooster, eraser, color, truck , mail B．Vacation, iii, travelled, licence, center C．Mail, traveled, sick, color, license D．Sick, truck, color, rooster, post
A．it has the largest number of speakers in the world B．it is spoken not only in Britain but also in America C．it is one of the most important working languages in many fields D．A, B and C