问题 选择题

通过对实验的观察、分析推理、得出正确的结论是化学学习的主要方法之一.对下列实验事实或现象的解释正确的是(  )

A.KI淀粉溶液中通入Cl2,溶液变蓝原因是淀粉能与Cl2发生显色反应

B.浓硝酸在光照条件下变黄是由于浓硝酸不稳定,生成有色物质能溶于浓硝酸

C.某溶液中加入硝酸酸化的氯化钡溶液,有白色沉淀生成说明该溶液中含有SO42-

D.常温下,浓硫酸可储存在铁质或铝制器皿中说明常温下铁和铝与浓硫酸不反应

答案

A.KI淀粉溶液中通入Cl2,生成I2,淀粉遇I2变蓝色,氯气和淀粉不反应,故A错误;

B.浓硝酸在光照条件下分解生成NO2,NO2溶于水而导致溶液变黄,故B正确;

C.SO32-可被硝酸氧化为SO42-,不能判断一定含有SO42-,故C错误;

D.铁和铝与浓硫酸发生钝化反应,故D错误.

故选B.

多项选择题 案例分析题
阅读理解

阅读理解。

     It came as something of a surprise when Diana, Princess of Wales, made a trip to Angola in 2004, to

support the Red Cross's campaign for a total ban on all anti-personnel landmines (地雷). Within hours of

arriving in Angola, television screens around the world were filled with images of her comforting victims

injured in explosions caused by landmines. "I knew the statistics," she said. "But putting a face to those

figures brought the reality home to me; like when I met Sandra, a 13- year-old girl who had lost her leg,

and people like her."

    The Princess concluded with a simple message: "We must stop landmines". And she used every

opportunity during her visit to repeat this message.

    But, back in London, her views were not shared by some members of the British government, which

refused to support a ban on these weapons. Angry politicians launched an attack on the Princess in the

press. They described her as "very ill-informed" and a "loose cannon (乱放炮的人)."

    The Princess responded by brushing aside the criticisms: "This is a distraction we do not need. All I'm

trying to do is help."

    Opposition parties, the media and the public immediately voiced their support for the Princess. To

make matters worse for the government, it soon emerged that the Princess's trip had been approved by

the Foreign Office, and that she was in fact very well-informed about both the situation in Angola and the

British government's policy regarding landmines. The result was a severe embarrassment for the

government.

    To try and limit the damage, the Foreign Secretary, Malcolm Rifkidnd, claimed that the Princess's

views on landmines were not very different from government policy, and that it was "working towards" a

worldwide ban. The Defence Secretary, Michael Portillo, claimed the matter was "a misinterpretation or

misunderstanding."

    For the Princess, the trip to this war-torn country was an excellent opportunity to use her popularity to

show the world how much destruction and suffering landmines can cause. She said that the experience

had also given her the chance to get closer to people and their problems.

1. Princess Diana paid a visit to Angola in 2004________ .  

A. to voice her support for a total ban of landmines

B. to clarify the British government's stand on landmines

C. to investigate the sufferings of landmine victims there

D. to establish her image as a friend of landmine victims

2. What did Diana mean when she said "... putting a face to those figures brought the reality

     home to me" (Line 5, Paragraph 1)?  

A. She just couldn't bear to meet the landmine victims face to face.

B. The actual situation in Angola made her feel like going back home.

C. Meeting the landmine victims in person made her believe the statistics.

D. Seeing the pain of the victims made her realize the seriousness of the situation.

3. Some members of the British government criticized Diana because_________ .

A. she was ill-informed of the government's policy

B. they were actually opposed to banning landmines

C. she had not consulted the government before the visit

D. they believed that she had misinterpreted the situation in Angola

4. How did Diana respond to the criticisms?

A. She paid no attention to them.      

B. She made more appearances on TV.

C. She met the 13-year-old girl as planned.  

D. She rose to argue with her opponents.

5. What did Princess Diana think of her visit to Angola? 

A. It had caused embarrassment to the British government.

B. It had brought her closer to the ordinary people.

C. It had greatly promoted her popularity. 

D. It had affected her relations with the British government.