单项选择题
A. the importance of developing writing skills B. the complexities of spelling C. the correct way of marking compositions D. the relationship between spelling and the content of a composition
A. lasting for a short time B. not deep C. unimportant D. developing very slowly
A. They promote international trade. B. They allow very rapid money transfers. C. They are still limited to small transactions(交易). D. They are dependent on good telecommunications systems.