问题
多项选择题
下列关于强心苷的提取分离正确的是（）
A.一般选用含水氯仿进行提取
B.为了提取原形强心苷元，可先用3%-5%的盐酸充分水解强心苷后，再提取
C.分离强心苷元或脂溶性苷时，一般采用硅胶吸附层析进行分离
D.分离弱亲脂性强心苷，一般宜用分配色谱法
E.分离弱亲脂性强心苷，一般宜用氧化铝吸附色谱法
答案
参考答案：C, D
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下列关于强心苷的提取分离正确的是（）
A.一般选用含水氯仿进行提取
B.为了提取原形强心苷元，可先用3%-5%的盐酸充分水解强心苷后，再提取
C.分离强心苷元或脂溶性苷时，一般采用硅胶吸附层析进行分离
D.分离弱亲脂性强心苷，一般宜用分配色谱法
E.分离弱亲脂性强心苷，一般宜用氧化铝吸附色谱法
参考答案：C, D
A rich American went into a shop in London. He wanted very much __31___ a nice looking watch. He saw a watch and liked it __32_____much that he decided to buy it. But the owner of the shop insisted five hundred dollars for it. When the American was hesitating, a young man suddenly came into the shop, took___33__out of the owner’s hand and ran out with it. It all happened in few seconds. When the owner ran out ___34____the street, the young man was already disappearing among the people. The American went on. At the next corner, he saw ___35_____with the stolen watch in his hand. “Don’t you want to buy a fine watch, sir?” he asked in a low_____36____ , “It’s only a hundred dollars.” “The young man doesn’t know _____37____saw him stealing the watch just now,” he thought. The American paid at once and went ___38______back to his room with the watch. He told his friend about the fine watch. His friend took a look at the watch and started laughing. He said, “You are ____39_____. The watch isn’t worth ___40______ten dollars. I’m sure the shop owner and the young man planned all this together.”
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