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问题 选择题

对于常温下PH为2的盐酸，叙述正确的是

A．c(H+) = c(Cl—) + c(OH—)

B．由H2O电离出的c(H+) =" 1.0" ×10—12 mol·L—1

C．与等体积PH=12的氨水混合后所得溶液显酸性

D．与等体积0.01 mol·L—1乙酸钠溶液混合后所得溶液中：c(Cl—) = c(CH3COO—)

答案

AB

题目分析：A、由电荷守恒可知：c(H+) = c(Cl—) + c(OH—)，正确；B、因为盐酸的PH为2，所以溶液中氢氧根离子的浓度为10—12 mol·L—1，而氢氧根离子完全是由于水电离子而生成的，因此由H2O电离出的c(H+) =" 1.0" ×10—12 mol·L—1，正确；C、与等体积PH=12的氨水混合后所得溶液显大碱性，错误；D、因为醋酸根离子要水解，因此有c(Cl—) ＞c(CH3COO—)，错误。

阅读理解

Do you know who is the most popular star on the Internet now? Yes, he is “Brother Coat”(大衣哥) Zhu Zhiwen!

A few months ago, Zhu Zhiwen was an unknown farmer. A video of his show has been watched by more than millions of people，now his videos are the most popular. Zhu Zhiwen attracts Chinese netizens'(网民的) hearts. And he is called “Brother Coat” by them.

In March 2011, he took part in a program called “I’m a Big Star”. He walked out onto the stage in a dark green coat. Then he began to sing the song of the TV drama Romance of Three Kingdoms. When the audiences heard rich and powerful voice，all of them stood up and cheered. After that, he became a well-known person.

The judges(评委) asked him if he had any professional training. Zhu said no. “When he started, I thought someone played the original tape(原声带) by mistake. But later on, I got it, ” said one of them, “we can’t judge a book by its cover.” At last, he won the first prize in the program of “I’m a Big Star”．

Zhu Zhiwen was born in a village of Shandong in 1969. He liked listening to the radio. When the music played, he sang it along. Every morning, he would get up early and practiced singing near a river. He keeps doing it for nearly 30 years.

“When I’m working in the fields, ”said Zhu Zhiwen, “I often sing for myself, some villagers even think me crazy，but I really love it. I’m not singing for money, I’m singing for ordinary people in China.”

Mrs. Sun, a 56-year-old engineer, one of his fans said, “I watched his videos without getting tired of it! It is so amazing, and every time I watch it, I am filled with excitement and his voice is perfect! I am crossing my fingers in hope that he has a bright future.”

小题1: Who gave Zhu Zhiwen the nickname of “Brother Coat”(大衣哥)?

A．His father.

B．The villagers.

C．His mother.

D．The netizens.小题2:When did Zhu Zhiwen become a well-known person?

A．In 1969.

B．In 2011.

C．Two years ago.

D．A few years ago.小题3:Why did the audiences stand up cheer when Zhu Zhiwen sang the song?

A．Because he was funny.

B．Because he wore a dark green coat.

C．Because his voice was rich and powerful.

D．Because he gave some gifts to the audiences.小题4: The underlined phrase “judge a book by its cover” in Paragraph 4 means ________.

A．以貌取人　

B．志存高远　

C．众口铄金

D．哗众取宠小题5:Which of the following is TRUE?

A．Zhu Zhiwen is 45 years old now.

B．Mrs. Sun enjoys Zhu Zhiwen’s songs.

C．A famous singer taught Zhu Zhiwen to sing.

D．Zhu Zhiwen often sang for his fans when he was young.
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