音质异常主要表现为 、 和等。音质的改变可由声带的 或引起。

《城市给水工程规划规范》中关于城市给水工程规划的主要内容，下列说法错误的是( )。

A．预测城市用水量，并进行水资源与城市用水量之间的供需平衡分析
B．选择城市供水水源，并提出相应的给水系统布局框架
C．确定给水枢纽工程的位置和用地、提出水资源保护及开源节流的要求和措施
D．规定了废水的处理与排放，提出相应的环境保护措施

教育的成层功能指的是分层教学（）

阅读理解。

     Authorities will continue to take a hard line on Internet-based rumors and punish those creating fake

information, a senior official said on Thursday.

     Authorities have removed more than 210,000 online posts and shut down 42 websites since

mid-March in their latest crackdown on online rumors, said Liu Zhengrong, a senior official with the State

Internet Information Office.

     Fake information or rumors spread through the Internet, especially on micro blogs, have harmed

social order and residents' daily lives, he said at a news briefing in Beijing.

     Before the crackdown, six people who allegedly fabricated (伪造) rumors about "military vehicles

entering Beijing" had been detained and 16 websites closed for disseminating fake online information,

according to police authorities.

     "What we've done and will do is to make sure residents can know what they want to know, say what

they think and supervise our management in a reliable and useful network environment," Liu said.

     Liu disagreed that the Internet can police itself against rumors, and told China Daily that some netizens

can't distinguish truth from fiction, "requiring government departments and website companies to take

measures".

     On Monday, the Internet Society of China posted a proposal calling on Internet companies and

websites to strengthen self-discipline and prevent the spread of online rumors.

     In response, three main Internet companies in the country - Sina, Baidu and Tencent - said they will

target fake information with advanced technology and invest in manpower to supervise online information.

     Zhao Zhiguo, deputy director of the Telecommunications Administration under the Ministry of Industry and Information Technology, said stricter self-management of websites will help banish online rumors.

     "Internet companies should take legal responsibility when operating their websites. They should not

become a hotbed for rumors and provide opportunities for fake information," Zhao said, adding they will

launch similar crackdowns to close illegal website companies and punish those responsible.

     Currently, people who make or spread rumors related to terrorism and securities trading, or

information affecting State security and companies' commercial reputations, will face criminal punishment.

     Liu Honghui, a Beijing lawyer specializing in online cases, said he welcomed the government's action

to curb online rumors.

     "Residents used online banks to shop or book flights, which needs a safe platform without fake

information," he said.

     Yu Guofu, another lawyer from Sheng Feng Law Firm, said the key to reducing rumors is netizens

themselves.

     "If micro-bloggers think twice before forwarding information, rumors will decrease."

1. How many websites were shut down before mid-March in the latest crackdown on online rumors?

A. 42

B. 58    

C. 16    

D. 18

2. What does the underlined word mean in fourth paragraph? 

A. creating    

B. spreading    

C. providing    

D. operating

3. According to the passage, which of the following is true? 

A. Not all netizens can distinguish truth from fiction on the Internet.      

B. People who have harmed social order will face criminal punishment.

C. The Internet Society of China called on micro-bloggers to prevent the spread of online rumors.

D. Three main Internet companies in the country promised to launch more crackdowns to close

      illegal websites.

4. Who plays an important role in reducing Internet-based rumors? 

A. Authorities    

B. Internet companies  

C. Micro-bloggers    

D. Police

反对立狄女为后的是（）

多个再沸器可采用一个疏水器。