【简答题】中央银行一般是负责制定和执行国家 ,调节 和 ,实施金融监管,并在一国金融体系中居于主导地位的金融机构。
【单选题】Please look at number 4 and choose the correct answer.
【简答题】若x 2 =9,那么x=______;若y 3 =-27,那么y=______.
【单选题】—Could you please help me choose an Mp4 player online? — __________. My computer doesn't work.