下列有关声音的说法正确的是[ ] A. 声是由物体振动产生的，振幅越大响度越大

看图，回答问题：这里的1949元是( )

　　①观念上的货币 ②讨价还价的基础

　　③这台液晶显示器的价值 ④这台液晶显示器的价格

A．③④

B．①④

C．②④

D．①②

2-甲基丙烯是制备有机玻璃的主要原料。现以2-甲基丙烯为原料，通过下列合成路线合成有机玻璃F。

根据上述过程回答下列问题：

(1)、填写反应类型：反应⑦是       ，反应⑤是      。

(2)、写出结构简式：B                   F             。

(3)、写出物质D中所含官能团的名称：                     。

(4)、写出反应③的化学方程式                                      。

如图所示，N匝矩形导线框以角速度ω在磁感应强度为B的匀强磁场中绕轴OO′匀速转动，线框面积为S，线框的电阻、电感均不计，外电路接有电阻R、理想交流电流表和二极管D．二极管D具有单向导电性，即正向电阻为零，反向电阻无穷大．下列说法中不正确的是（　　）

A．图示位置电流表的示数为0

B．R两端电压的有效值U=

C．一个周期内通过R的电荷量q=

D．交流电流表的示数I=

Reading comprehension.

     Anthony Horowitz was miserable (痛苦的) as a child. He was, as he puts it, "not very bright" and couldn't

win the attention of his very wealthy parents, who preferred his "clever" older brother. At age 8, Horowitz was

sent away to an abusive (虐待的) boarding school in his native England, even though he screamed and pleaded

(恳求) with his parents year after year not to send him. "The thought was, 'It'll be good for him'," Horowitz

recalls(回忆).

     It was not. Horowitz did badly in his studies, had few friends and was bullied (欺负) for five years. "My

teachers couldn't have had a lower opinion of me," he said. "I wasn't even smart enough to rebel (反抗). The

one thing I remember from the very earliest age was this desire to write. When I was 10 years old, I remember

asking my parents to get me a typewriter for my birthday because I wanted to be a writer."

     Now, at 55, Horowitz is one of the world's most successful children's book authors. His Alex Rider series

has sold more than 5 million copies, and the eighth book featuring the young spy. Crocodile Tears, came out

this month.

     The Alex Rider books tell the adventures of 14-year-old Alex Rider, an agent for the British intelligence

agency MI6.

     Horowitz said he doesn't try to write for kids; it just comes out that way. "I have a feeling it's to do with

purity and simplicity. I give as little information as is necessary to describe the room, the character in the room,

and get on with the action," he said.

     That style has also made Horowitz a successful writer of television shows for adults in Britain because, he

says, writing books for kids is a lot like writing television for grown-ups. In both cases, it's all about entertaining

people with a good story.

     Now, Horowitz couldn't be happier with his life. He sums up his success:"... you can be anything you want

to be if you just believe in yourself. I do believe it completely."

1. The text is mainly about _____. [ ]

A. Horowitz's popular book-Alex Rider

B. Horowitz's miserable childhood

C. Horowitz, a successful children's writer

D. Horowitz's special writing style

2. In his childhood, Anthony Horowitz _____.[ ]

A. was more intelligent than his brother

B. was paid more attention by his parents

C. couldn't understand why he was sent to the boarding school

D. led a miserable life because of poverty

3. In the boarding school, Horowitz's teachers [ ]

A. showed great concern for him

B. often abused and bullied him

C. taught him how to write stories

D. thought little of his ability

4. Which of the following is true of Anthony Horowitz? [ ]

A. He was the beloved child of his family.

B. He benefited a lot from boarding school.

C. He emphasizes the plot rather than characters in stories.

D. Although he is successful, he isn't very happy.

5. What advice does Horowitz have for readers? [ ]

A. Confidence is the key to success.

B. Hardship teaches valuable lessons.

C. Interest is the best teacher.

D. Diligence is the parent of success.

相对指标中的( )是同类现象在同一时间、不同空间条件下所进行的静态对比，表明同类事物在不同空间条件下的数量对比关系。

A．比较相对指标
B．比例相对指标
C．结构相对指标
D．强度相对指标