书肆

“Millions of young people will lose their hearing in five years if they listen to MP3 or MP4 players at a too high voice every day,” scientists say recently.

Do you often listen to MP3 players at a too high voice? Are you frightened to hear this?

The sizes of MP3 players are very small, but small MP3 players make it easy to take hundreds of songs with you. So many young people carry them and listen to music every day. MP3 players are very popular among students. 

The scientists say teenagers should be far from high volume (音量), including mobile phones’ noise. A study says, “High volume and long listening time can cause hearing problems.” They think if young people listen at more than 89 decibels (分贝) every day, they will lose their hearing in five years. A scientist said, “So many young people often use personal music players and mobile phones at a high voice. I am afraid that they may be losing their hearing.

So let’s turn our MP3 players down!

小题1:According to the passage, which of the following is true?

A．Scientists tell young people to turn off their MP3 players.

B．Teenagers will lose their hearing if they listen to hundreds of songs in MP3 players.

C．A person will lose hearing in 5 years if he or she listens to an MP3 player every day.

D．The mobile phone can also cause hearing problems if we don’t use it correctly.小题2:The underlined word “they” (Paragraph 4) most probably refers to ______.

A．scientists

B．MP3 players

C．mobile phones

D．teenagers小题3:Which might be the best title for this passage?

A．Turn your MP3 players down!

B．Never use MP3!

C．How to protect your hearing.

D．Young people’s hearing.

不属于胃液的作用

A．激活胃蛋白酶原

B．杀菌

C．使蛋白质变性

D．对淀粉进行初步消化

（）是指机务、车辆、工务、电务、供电等段专用并由其管理的线路。

A、正线

B、站线

C、段管线

D、特别用途线

设计合同示范文本规定，初步设计文件应当满足( )的需要。

A．控制概算

B．施工

C．编制施工招标文件

D．编制施工图设计文件

E．主要设备材料订货

认为问题解决的过程就是通过一系列的操作达到目标的过程，持这种观点的理论叫做( )。

A．信息加工论
B．完形理论
C．联结说
D．顿悟说