第24题: [单项选择]下列说法正确的是( )。 A. 广谱抗生素是非处方药可自行购买 B. 广谱抗生素的效果优于窄谱抗生素 C. 使用广谱抗生素不容易产生耐药性 D. 致病菌未知应优先选择广谱抗生素 参考答案:D 答案解析:广谱抗生素是指抗茵谱比较宽的药物,简单说就是能够抵抗大部分细菌的药物,还有一种就是窄谱抗生素,它是专门杀灭某一种或一类细菌的药物。因此在致病菌未知时应优先选择广谱抗生素,D项正确。抗生素都是处方药,应
第37题: [单项选择]A. A professional service that brings people the sense of security. B. A professional bodyguard that offers the services of protecting people. C. A product that prevents people from burglary. D. A toy that arouses people’s sense of security. 参考答案:C 答案解析:[听力原文] M: Jane, I heard you own an "idea" company which sales people creative ideas to better the