If the firms failed to make enough money, they would _____. [ ]

A. close down

B. call off

C. turn down

D. set off

香豆素类药物用量过大引起出血时，应立即停药和缓慢静脉注射大量( )。

A．葡萄糖
B．维生素C
C．地塞米松
D．维生素K
E．氨甲苯酸