冠心病的主要症状是发作性心绞痛。
参考答案:对
She likes playing ___________violin while her brother likes playing _________ tennis.[ ]
A. the;the
B. the;/
C. /;the
D. /;/
两汉之际,地处丝绸之路两端的国家是( )
A.汉——身毒
B.汉——安息
C.汉——大食
D.汉——大秦