一国经济开放程度最关键的因素是（）
A.资源禀赋
B.国家大小
C.经济制度性质
D.资本流出入量
参考答案：C
Paul’s parents were worried that he ____ too much time chatting on line.
A．spent
B．cost
C．paid
D．took
如果RSI比例大，就是强市；如果RSI比例小，就是弱市。( )
