老年人感染时，用药的原则是
A. 使用糖皮质激素抗感染
B. 大剂量有杀菌作用的抗生素
C. 选用杀菌作用强的药物，尽量避免用氨基糖苷抗生素。
D. 选作用温和的抗生素，加大剂量使用
E. 选用抑菌药物，缩短用药时间
Questions 9 to 12 are based on the conversation you have just heard.
A. International trade.
Business studies.
C. Information technology.
D. English.
Questions 1 to 8 are based on the conversation you have just heard.
A. The man wants to attend tomorrow’s show.
B. There aren’t any tickets left for tonight’s show.
C. There aren’t any tickets left for tomorrow’s show.
D. The man doesn’t want to attend tomorrow’s show.
( )国内水路、陆路货物运输保险分为基本险和综合险。
A. 对
B. 错
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