抗血小板治疗药物（）
A.rt-PA
B.低分子肝素
C.阿司匹林
D.降纤酶
E.低分子右旋糖酐
参考答案：C
He realized his mistakes and took action to reduce the loss _______ it was too late.
A．until
B．when
C．before
D．as
普通感冒的典型症状是：（）
A、流清鼻涕
B、胃痛
C、头晕
D、哮喘
