终止心绞痛发作应选用（）
A.地高辛
B.美托洛尔
C.卡托普利
D.硝苯地平
E.硝酸甘油
参考答案：E
Minister Bill De Blasio in office fewer than 48 hours when he came face to face with his biggest challenge in his life．
A．has been
B．had been
C．would be
D．is
选择性缄默症通常发生在( )
A．2～3岁 B．3～5岁C．5～7岁 D．7～8岁
