单项选择题
A．he didn’t agree with Aristotle B．he could not hide the scientific truth C．he worked for the Church D．his friends advised him to do so
A．important for graduate students in humanities B．difficult for graduate students in humanities C．common for undergraduate students in science D．easy for undergraduate students in science
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.