下列关于科学史料叙述错误的是( )
A．1828年，德国化学家维勒第一次以无机化合物为原料合成有化合物尿素
B．1838年，德国化学家李比希提出“基团理论”
C．1866年，德国化学家凯库勒提出了苯环结构，称为凯库勒式：
D．1965年，中国科学家在世界上第一次用人工方法合成了结晶牛胰岛素
答案：C
题目分析：A、1828年，德国化学家维勒首次用无机物质氰酸氨与硫酸铵人工合成了尿素，正确；B、1838年，德国化学家李比希提出“基团理论”，正确；C、1866年，德国化学家凯库勒提出了苯环结构，称为凯库勒式应为
，错误；D、1965年，中国科学家在世界上第一次用人工方法合成了结晶牛胰岛素，正确，答案选C。
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| Mr Smith was having trouble with his stomach, 1 he went to see a doctor. The doctor 2 his stomach carefully but couldn't find any problem. Then he said, "Well, Mr Smith, take it easy. There is 3 serious. Stop smoking and then you will be all right very 4 ." "But doctor," answered Mr Smith, "I 5 . I don't like smoking at all." "Oh, I see," said the doctor," then stop 6 wine from now on." "But I don't drink wine," answered Mr Smith. "Don't drink 7 tea or coffee then," the doctor said to him. "I _8 drink water," answered Mr Smith, "I don't like tea or coffee." The doctor _9_ for a while and then said," Well, what do you like to eat then?" "Potatoes! I like potatoes very much." Mr Johnson answered at once. "All right, Then stop 10 potatoes." Said the doctor as he got up to say goodbye to Mr Smith. | ||||
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