第21题: [单项选择]下述哪种药物易出现快速麻醉耐药现象() A. 丁卡因 B. 普鲁卡因 C. 利多卡因 D. 丁卡因 E. 布比卡因 参考答案:C
第22题: [单项选择]In previous times, when fresh meat was in short______, pigeons were kept by many households as a source of food. A. store B. provision C. reserve D. supply 参考答案:D 答案解析:[解析] in short supply构成固定短语,意为“不足的,缺乏的”。