问题 实验题

(4分)下表是空气中的气体成分和人体呼出的气体成分含量对照表:

气体成分氮气氧气二氧化碳其他气体
空气中的气体(﹪)78210.030.070.9
呼出的气体(﹪)781641.10.9
某校研究性学习小组的同学设计了简单的实验方案,验证呼出的气体与吸入的气体成分的含量有什么不同,其四个主要操作步骤如图(1、2、3、4)所示,请依据图示将主要实验操作步骤及验证依据填入下表中的空白处:

实验步骤验证依据
1、用排水法收集两瓶呼出的气体,另收集两瓶空气。 
2、将澄清石灰水分别滴入盛有呼出的气体和空气的集气瓶中。根据                      ,判断二氧化碳含量不同。
3、                                 

                                  

根据木条燃烧情况的不同,判断氧气含量不同。
4、                                

                                 

根据                           ,判断水含量不同。

答案

石灰水变浑浊的程度不同   将燃着的木条分别伸入盛有呼出的气体和空气的集气瓶中    取两块干燥的玻璃片,对其中一块呼气    玻璃片上水蒸气的多少

利用氧气能助燃,二氧化碳能使澄清石灰水变浑浊,水蒸气遇冷变成液态的水,解决此题故答案为:

实验步骤 验证依据
  
 将澄清的石灰水分别滴入盛有呼出的气体和空气的集气瓶中 根据石灰水浑浊程度的不同判断CO2含量不同
 将燃着的木条分别放人盛有呼出的气体和空气的集气瓶中 根据木条燃烧情况的不同判断O2含量不同
 取两块干燥的玻璃片,对着其中的一块呼气 根据玻璃片上水雾的不同判断水含量不同

阅读理解

阅读理解。

     British author JK Rowling was at the release of her latest Harry Potter book called "Harry Potter and

the Deathly Hallows" at the Natural History Museum in London, Friday July 20, 2007.

     J.K. Rowling has been spotted at cafes in Scotland working on a detective novel, a British newspaper

reported Saturday.

     The Sunday Times newspaper quoted Ian Rankin, a fellow author and neighbor of Rowling's, as saying the creator of the "Harry Potter" books is turning to crime fiction.

     "My wife spotted her writing her Edinburgh criminal detective novel," the newspaper quoted Rankin as

telling a reporter at an Edinburgh literary festival.

     "It is great that she has not abandoned writing or Edinburgh cafes," said Rankin, who is known for his

own police novels set in the historic Scottish city.

     Rowling famously wrote initial drafts of the Potter story in the Scottish city's cafes. Back then, she was a struggling single mother who wrote in cafes to save on the heating bill at home.

     Now she's Britain's richest woman - worth $1 billion, according to Forbes magazine - and her seven

Potter books have sold more than 335 million copies worldwide.

     In an interview with The Associated Press last month, Rowling said she believed she was unlikely to

repeat the success of the Potter series, but confirmed she had plans to work on new books.

     "I'll do exactly what I did with Harry - I'll write what I really want to write," Rowling said.

1. What is JK Rowling famous for?

A. detective novels

B. crime fiction

C. Harry Potter books

D. love stories  

2.Which of the following is Not rue about Ian Rankin?

A. He is a writer famous for police novels.

B. Most of the stories in his novels happened in the historic Scottish city.

C. It was Rankin himself who witnessed JK Rowing writing her Edinburgh criminal detective novels.

D. He told the British newspaper The Sunday Times about JK Rowling's novels.

3. Why did Rowling like to write the "Harry Potter stories" in the cafes?

A. Because she was a romantic woman and the atmosphere in the cafes gave her lots of inspiration.

B. Because she was a single mother at that time and she wanted to find a husband there.

C. Because her children were so naughty at home and she had to go to a quiet place for her writing.

D. Because she thought that writing in a cafes could help her save some money.

4. What can we learn from the passage?

A. The seven Harry Potter series made JK Rowling a success.

B. JK Rowling had made enough money so she decided to stop writing.

C. Rowling planned to write new books because Harry Potter was not exactly what she wanted.

D. Ian Rankin and his wife earned money by telling reporters news about JK Rowling.

5. What is the best title for the passage?

A. Harry Potter and JK Rowing

B. Ian Rankin, A Neighbour of JK Rowling

C. A Successful Woman JK Rowling

D. JK Rowling writing Detective Novels

单项选择题