患者，男。37岁，支气管哮喘重度发作3天，使用氨茶碱，沙丁胺醇，大剂量激素治疗无效。
题型：单项选择题
问题：
患者，男。37岁，支气管哮喘重度发作3天，使用氨茶碱，沙丁胺醇，大剂量激素治疗无效。体检：呼吸浅快，口唇发绀，神志不清，双肺哮鸣音较弱，血气分析：PaO250mmHg，PaCO270mmHg，进一步救治措施应为（）
A.静脉推注地塞米松
B.给予高浓度吸氧
C.静脉滴注5%碳酸氢钠
D.联合应用抗生素静脉滴注
E.气管插管，正压机械通气
题型：单项选择题
用下列词组的正确形式完成句子。
1 .Li Hong is such a girl who can _______her attention her study for a whole class.
2. Yesterday a robber, who refused to give in, was _______and fired to death by the policeman.
3. An old worker was found__________a painting of Tang Dynasty.
4. On May Day, _________shoppers entered the supermarket,
5. She is a talented musician ___________a photographer.
6. When the earthquake happened,_________, about 150 students were having PE lessons on the
playground.
7. She looked through_________information for the report.
8. __________to reach the mountain summit,they made preparations for everything.
9. Practical experience, ____________,can give us more useful knowledge.
10. It is dangerous to_______the union.