The main idea of the passage is that the United States Presidents should ______
A. have wide political experience
B. serve for a term of less than six years
C. serve for a term of more than six years
D. be allowed to be reelected
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苯并二氮杂革类药物盐中被置换出的无机酸类，在醋酸介质中的酸性强弱顺序
A. 高氯酸＞氢溴酸＞硫酸＞盐酸＞硝酸
B. 高氯酸＞硫酸＞盐酸＞氢溴酸＞硝酸
C. 硫酸＞盐酸＞氢溴酸＞高氯酸＞硝酸
D. 硫酸＞高氯酸＞氢溴酸＞盐酸＞硝酸
E. 氢溴酸＞硝酸＞硫酸＞盐酸＞高氯酸
奎宁是一种弱碱，溶剂滴定应选择的溶剂为
A. 纯水
B. 液氨
C. 冰醋酸
D. 甲苯
E. 甲醇
What is always a good way to end the speech？
A. Leave the PPT on to help audience take notes.
B. Keep away from the troublesome Q& A session.
C. Wait until the audience have no more questions.
D. Wind up questions and give the closing statement.
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