第12题: [单项选择]软膏基质对药物的透皮吸收影响如下,叙述正确的是: A. 基质对药物的亲合力越大,药物越易吸收 B. 当基质的pH值小于酸性药物的pKa时,有利于药物的透皮吸收 C. 当基质的pH值小于碱性药物的pKa时,有利于药物的透皮吸收 D. 基质对皮肤的水合阻碍了药物的吸收 E. 在基质中加入表面活性剂一般有利于药物的释放和穿透,通常阴离子表面活性剂的作用小于非离子表面活性剂的作用 参考答案:B
第18题: [单项选择]Questions 19 to 22 are based on the conversation you have just heard.A. She saw students protesting last week. B. One of her roommates told her about it. C. She attended one of its meetings before.D. She read about it in the newspaper. 参考答案:D 答案解析:[解析] 19-22 W: Hmm, hi. M: Hi. I’m going door to door tonight to tell people about the Student