问题
单项选择题 B型题
主要根据氢键吸附原理分离物质的方法是（）
A.聚酰胺色谱法
B.凝胶过滤法
C.离子交换法
D.硅胶柱色谱法
E.纸色谱法
答案
参考答案：A
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主要根据氢键吸附原理分离物质的方法是（）
A.聚酰胺色谱法
B.凝胶过滤法
C.离子交换法
D.硅胶柱色谱法
E.纸色谱法
参考答案：A
To celebrate the end of our exams, my friends and I went to a fast food restaurant. We 1 hamburgers and Coca Cola at the counter. When our 2 came, I started walking towards an empty table. By bad luck, my purse strap (带子) got 3 on a chair and the tray (托盘) that I was holding slipped 4 my hands and went flying in the air. The tray, and its contents, 5 on a man who was just about to 6 a bite of his sandwich. I stared, greatly 7 , as the drinks soaked (浸湿) his white shirt. Then I 8 my eyes and prepared myself for his burst of 9 . Instead, he said “It’s OK” to 10 me before he disappeared into the washroom. Still shaky and unsure 11 to do next, my friends and I went to a table and sat there, trying our best to look 12 . A moment later, the man came out of the washroom and 13 our table. My heart almost stopped 14 . I thought he was going to ask for my father’s 15 and call him. To my surprise, he merely smiled at us, handed us some cash and said, “ 16 yourself new hamburgers.” He then walked 17 without even finishing his food. He could have made what was already an uncomfortable situation worse, 18 he chose a different way and gave us a reason to believe that there is still 19 in this world. I ‘ll never 20 his action.
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