单项选择题
A．Studying is easier in America. B．American university only pays attention to foreign students’ TOEFL scores. C．Every country should reform their university systems. D．We should know something about other countries.
A．It is a kind of computer games. B．It is an area. C．It is the place where you can play the computer games cheaply. D．It is a park.
A．They connect invisible phenomena to those we are familiar with. B．Scientists could not experiment without them. C．They give the scientist a sense of security. D．They provide deeper insight into the workings of the human min