心律失常常见症状表现为（）
A.胸闷
B.心悸
C.恶心、呕吐
D.腹痛
E.头晕、黑矇
参考答案：A, B, E
度数自西向东增加的是_____经度，度数自北向南增加的是_____纬度。
．________ relation between China and Russia has developed steadily since Vladimir Putin was reelected ________ president last May.
A．The; the
B．A; the
C．The; /
D．A; /
