关于加密技术，下列哪种说法是错误的A．对称密码体制中加密算法和解密算法是保密的 B．

以下叙述正确的是 [ ]

A．由不同元素组成的物质一定是化合物

B．含有氧元素的化合物是氧化物

C．燃烧都是剧烈的发光发热的化合反应

D．分子是构成物质的一种微粒

简述现代权变组织理论。

Britain and France are separated by the English Channel, a body of water that can be crossed in as few as 20 minutes. But the cultures of the two countries sometimes seem to be miles apart.

　　Last Thursday Britain and France celebrated the 100th anniversary(周年纪念) of the signing of a friendship agreement called the Entente Cordiality. The agreement—signed in London on April 8, 1904—marked a new beginning for the countries following centuries of wars and love-hate partnership.

　　But their relationship has been ups and downs over the past century. Just last year, there were fierce disagreements over the Iraq war—which British Prime Minister Tony Blair supported despite(不管, 尽管) French President Jacques Chirac speaking out against it. This discomfort is expressed in Blair and Chirac's body language at international meetings. While the French leader often greets German Chancellor Gerhard Schroeder with a hug (拥抱), Blair just receives a handshake.

However, some political experts say the war in Iraq could in fact have helped ties. “The British population was against war, ” said Francois Heisbourg, director of the Paris-based Foundation for Strategic Research(战略基金研究会). “So it could have actually helped bring the two sides closer. ”

　　The history of divisions(分割, 区分) may well be because of the very different ways in which the two sides see the world. “The French think Britain is not doing its best to become part of Europe by not introducing the single European currency(货币), ” said Geoff Hare, a former lecturer in French politics and language at Newcastle University in Britain. “France has spent the past 15 to 20 years making itself seen as part of the European Union. ”

　 But this doesn't stop 12 million Britons taking holidays in France each year. However,only 3 million French come in the opposite direction. Surveys show that most French people feel closer to the Germans than they do to the British. And the research carried out in Britain has found that only a third of the population believes the French can be trusted.Perhaps this bad feeling comes because the British dislike France's close relationship with Germany. Or because the French are not happy with Britain's close links with the US.

　　Whatever the answer is, as both sides celebrate 100 years of “doubtful friendship”, they are at least able to make jokes about each other. Here's one:What's the best thing about Britain's relationship with France? The English Channel.

1. For centuries, the relationship between England and France is______.

A. friendly

B. impolite

C. brotherly

D. a mixture of love and hate

2. The war in Iraq does ______ to the relationship between France and England.

A. good

B. harm

C. neither good nor harm

D. both good and harm

3. The British are not so friendly to ______ and the French are not so friendly to ______.

A. Germany;America

B. America;Germany

C. Germany;Germany too

D. America;America too

4. What does the last sentence mean?

A. As long as the English Channel exists, no further disagreement will form between France and Britain.

B. The English Channel can prevent anything unfriendly happening in both France and Britain.

C. France and Britain are near neighbors, and this will help balance the relationship between them.

D. The English Channel is the largest enemy between France and Britain.

5. What is the main idea of this passage?

A. The British differ greatly from the French in culture, origin and custom.

B. The British and The French are against each other because of the very different ways in which they see the world.

C. The celebration of the 100th anniversary of the signing of a friendship agreement mark-ed the mixture feeling of love and hatred over the last century between Britain and Franc-e.

D. The British dislike France's close relationship with Germany, while the French are not happy with Britain's close links with the US.     

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