—Hello! May I speak to Mr Smith?

—________, please. He's answering another call right now. [ ]

A. Go on

B. Come on

C. Keep on

D. Hold on

女患，55岁，脑梗死后第3日出现意识不清。查体：血压190／100mmHg，右侧偏瘫，腰椎穿刺检查脑脊液压力为280mmH₂O。首选的治疗药物是（）

A.降压药

B.扩张血管药

C.尿激酶静脉点滴

D.20%甘露醇静脉滴注

E.低分子肝素腹部皮下注射