第5题: [单项选择]选用乙醇作药材浸提溶剂时，下列表述中错误的是 A. 乙醇浓度20%以上时具有防腐作用 B. 乙醇浓度大于20%时，能延缓酯类、苷类等成分水解 C. 乙醇浓度50%以下时，适于浸提苦味质、蒽醌苷类等 D. 乙醇浓度50%～70%时，适于浸提生物碱、苷类等 E. 乙醇浓度90%以上时，适于浸提挥发油、有机酸、树脂等 参考答案:B
A. would spend the whole life in the United States B. mostly graduated from the U.S. institutes of technology C. all choose the physics as their favorite major D. wonder the way in which their theories are tested 参考答案:D 答案解析:细节题。题目问的是：根据作者表达的意思，我们年轻的理论学家______。文章第四段第一句话提到：All of our interviewees share a willingness to push
