第11题: [填空题] You’ll hear a talk on how to make oral presentations. As
you listen,you must answer Questions 21~30 by writing NO MORE THAN THREE words
in the space provided for you. You’ll hear the conversation TWICE.
Can you give an example of "filler words" 参考答案:And so on./And so forth.
第31题: [单项选择]不溶于一般的有机溶液,而溶于酸性三氯甲烷的是()。 A. 喜树碱 B. 石蒜碱 C. 氧化苦参碱 D. 麻黄碱 E. 槟榔次碱 参考答案:A 答案解析:本题考查要点是"生物碱的理化性质"。①喜树碱不溶于一般有机溶剂,而溶于酸性三氯甲烷等。②石蒜碱难溶于有机溶剂,而溶于水。③氧化苦参碱为含N-氧化结构的生物碱,这类生物碱具有配位键结构,可溶于水。④麻黄