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问题 选择题

将pH=3的盐酸溶液和pH=11的氨水等体积混合后，溶液中离子浓度关系正确的是   [ ]

A．c(NH4+)＞c(Cl–)＞c(H+)＞c(OH–)     

B．c(NH4+)＞c(Cl–)＞c(OH–)＞c(H+)   

C．c(Cl–)＞c(NH4+)＞c(H+)＞c(OH–)     

D．c(Cl–)＞c(NH4+)＞c(OH–)＞c(H+)

答案

答案：B

填空题

根据短文内容，用括号内动词的正确时态形式填空。

     Liu Xiang was born in Shanghai on the 13th of July, 1983. He is 1.88m tall and 1______(weigh) 74

kilograms. He began practicing jumping when he was at Grade Four in primai7 school. He 2______ (win) the

gold medal of the men's 110m hurdles in the 28th Olympic Games. It is the first gold medal that Chinese have

won from this competition in the Olympic history. He 3______(be) a great hero in Chinese eyes since then. He

also likes singing and seeing films. Once when he 4______(walk) in the street, he stopped to answer the

reporter, "I 5______(sing) songs with friends if I feel tired after training, or go to a movie for relaxation."

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问答题 简答题

1888年美国人创办的格致书院后来发展成为。
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