问题
单项选择题 A1/A2型题
电泳的主要原理是（）。
A.带电物质在电场的作用下，向着异种电荷电极的方向移动
B.带电物质在电场的作用下，向着同种电荷电极的方向移动
C.缓冲液中有与分离物质发生反应的体系
D.根据样品的溶解性质
E.根据样品的分子量的大小
答案
参考答案：E
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电泳的主要原理是（）。
A.带电物质在电场的作用下，向着异种电荷电极的方向移动
B.带电物质在电场的作用下，向着同种电荷电极的方向移动
C.缓冲液中有与分离物质发生反应的体系
D.根据样品的溶解性质
E.根据样品的分子量的大小
参考答案：E
| 完形填空。 | |||
| When Liu Kaiqu was young he was poor in Shanghai. One day he 1 a picture of a tiger and tried to sell it on the street. It caught the 2 of an American, who asked, "How much does it cost?" He said, "500 dollars." The foreigner thought it was too 3 and asked again, "Can you make it cheaper?" He answered, "No." Then he tore (撕) it into pieces. In great 4 , the foreigner said, "Young man, are you angry?" "No, sir. I'm not angry. I sold it 5 500 dollars because I thought it was worth the 6 . But you wanted a lower price. It means 7 didn't think so and it is not good enough. I'll go on working 8 until my customers (顾客) are satisfied." At that time, 9 Liu Kaiqu was not famous at all, he never 10 his dream. Now he is well-known all over the world as a great artist. | |||
| ( )1. A. stole ( )2. A. attention ( )3. A. terrible ( )4. A. fear ( )5. A. over ( )6. A. size ( )7. A. we ( )8. A. faster and faster ( )9. A. though ( )10. A. broke off | B. picked B. instruction B. big B. difficulty B. for B. price B. he B. better and better B. because B. cut up | C. drew C. decision C. old C. surprise C. about C. weight C. you C. slower and slower C. whether' C. gave up | D. saw D. discussion D. dear D. excitement D. among D. position D. it D. harder and harder D. until D. sent off |