问题
单项选择题 A1/A2型题
能引起四环素牙的药物组合是（）
A.先锋霉素、土霉素、盐酸四环素
B.土霉素、地美环素、盐酸四环素
C.庆大霉素、盐酸四环素、缩水四环素
D.青霉素、盐酸四环素、土霉素
E.林可霉素、盐酸四环素、土霉素、地美环素
答案
参考答案：B
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能引起四环素牙的药物组合是（）
A.先锋霉素、土霉素、盐酸四环素
B.土霉素、地美环素、盐酸四环素
C.庆大霉素、盐酸四环素、缩水四环素
D.青霉素、盐酸四环素、土霉素
E.林可霉素、盐酸四环素、土霉素、地美环素
参考答案：B
Li Dong is a farmer. He has a very big 46 . On the farm, he grows oranges, grapes and bananas. Many people come to 47 his farm. He is a successful young man and becomes very famous. In 2003, he went back to his hometown 48 he finished middle school. “What work can I do?” he said to himself. Then he had an idea. “I’m interested 49 farming. I can grow fruit!” He began to watch many 50 on TV about growing fruit. He also read a lot of books about it. Then he went to 51 on Mr Wang’s farm for two years. He learned a lot there. In 2005, he started his own fruit farm. 52 , Li Dong’s farm was small. But now, his farm is much 53 . His fruits are very good. He sends them to many big 54 in China, such as Shanghai, Beijing and Guangzhou. He also grows vegetables and raises chickens on his farm. His family eats very 55 food. He has a very happy family.
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