第11题: [单项选择]下列说法与毛果芸香碱相符的是() A. 是一种生物碱 B. 无色或白色结晶粉末 C. 是胆碱受体激动剂 D. 分子结构中有两个手性中心 E. 以上都对 参考答案:E 答案解析:毛果芸香碱是由芸香科植物毛果芸香中提取分离出来的一种生物碱。为无色或白色结晶粉末。属于胆碱受体激动剂。分子结构中含有两个手性中心。
第27题: [单项选择]According to the passage, the decline of good manners is more worrying because______. A. it leads to more crime in society B. people view manners as old-fashioned C. rudeness on the street cannot be stemmed out D. it can seriously affect our daily life 参考答案:D 答案解析:由第三段最后一句As they are encountered far more often than come,they can cause more anxiety than crime可以推断选