作为一种宏观经济调控手段，计划手段( )。 A．既是一种行政手段，又是一种经济手段

一元二次方程x²-3x+1=0的两根为x₁、x₂，则x₁+x₂-x₁•x₂=______．

先天性胆总管囊肿择期手术治疗选择哪几种手术方式较为理想

A．胆总管囊肿与十二指肠侧吻合

B．胆总管囊肿与空肠ROUX-en-Y吻合

C．胆总管囊肿切除，胆总管空肠ROUX-en-Y吻合

D．胆总管囊肿切除，空肠间置代胆道，肝总管十二指肠吻合术

E．胆总管外引流术

阅读下面这首宋词，完成问题。

　　【注】①此词是作者罢相后晚年于江宁半山之作。

1．“数间茅屋闲临水，窄衫短帽垂杨里”描绘了一个什么样的词人形象？

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2．“花是去年红，吹开一夜风”两句虽是写景，但是作为一个曾经 锐意改革的政治家，却用它寄托了许多情感，请结合试卷简要分析。

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阅读理解。

     It came as something of a surprise when Diana, Princess of Wales, made a trip to Angola in 1997, to

support the Red Cross's campaign for a total ban on all anti-personnel landmines. 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 m atters 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 Rifkind, 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 Defense 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 1997 ________.

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

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

C. to investigate the sufferings of landmine victims there

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

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

     me" (Line 5, Para. 1)?

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

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

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

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

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

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

B. It had caused embarrassment to the British government.

C. It had greatly promoted her popularity.

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

4. How did Diana respond to the criticisms?

A. She made more appearances on TV.      

B. She paid no attention to them.

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

D. She rose to argue with her opponents.

冒口对铸件进行补缩的作用的必要条件是（）。

A.冒口体积足够大

B.冒口中的合金液比铸件被补缩处后凝固

C.冒口模数大

D.冒口模位置高