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问题 单项选择题

凝血酶的主要作用是

A．激活因子Ⅻ

B．分解纤维蛋白原

C．加速因子Ⅷ复合物的形成

D．加速凝血酶原复合物的形成

E．加强因子Ⅷ的作用

答案

参考答案：B

解析：血液凝固是一个连续的酶促反应，凝血酶原被因子X激活转变为凝血酶，凝血酶的主要作用是分解纤维蛋白原，使之转变为纤维蛋白，后者最终形成不溶于水的纤维蛋白凝胶。

改错题

在近现代史上，中美两国的外交关系风云变幻，跌宕起伏，对世界历史的发展产生了重大影响。请阅读材料，回答问题。

材料一：美国在巴黎和会上未获实利，随即将目光转向了东方，加快了同日本争夺远东和太平洋的步伐。在美国发起下，1921-1922年间，美、英、中等九国在华盛顿举行国际会议。

材料二：1942年1月，中美英苏等26个国家在华盛顿共同签署宣言。宣言把不同社会制度、社会意识形态、不同种族、不同语言、不同宗教信仰的国家集合到了反法西斯的大旗之下……为最终打败法西斯奠定了坚实的基础。

材料三：中国国家副 * * 习 * * 2012年1月16日在尼克松总统访华和上海公报发表40周年纪念活动上致辞说，推动中美关系发展，既是双方的共同责任，也是国际社会的共同期待。……总之，这是一个中美相互激励的时代……太平洋之大、世界之广，足以包容崛起的中国与美国。                  

——阮宗泽《习 * * 访美：深化共识，同舟共济》

（1）“中国是华盛顿会议最大的受害者”。结合所学知识回答，华盛顿会议给中国带来了什么影响？（1分）

（2）根据材料二，写出这一宣言的名称。并指出各国共同签署这一宣言的目的何在？（2分）

（3）根据材料三，概括指出中美关系友好发展的重大意义何在？（2分）

（4）综合以上材料，面对“中美应构建一种怎样的外交关系”这一问题，向中美领导人各提一条合理化建议。（2分）
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单项选择题

Aspirin is one of the safest and most effective drugs invented by man. The most popular medicine in the world today, it is an effective pain reliever. Its bad effects are relatively mild. It is also cheap.For millions of people suffering from arthritis, it is the only thing that works. Aspirin, in short, is truly the 20th-century wonder drug. It is also the second largest suicide drug and is the leading cause of poisoning among children. It has side effects that, although relatively mild, are largely unrecognized among users.Although aspirin was first sold by a German company in 1899, it has been around much longer than that. Hippocrates, in ancient Greece, understood the medical value of tree barks and leaves which today are known to contain a chemical found in aspirin. During the 19th century, there was a great deal of experimentation in Europe with this chemical, and it led to the introduction of aspirin. By 1915, aspirin tablets were available in the United States.A small quantity of aspirin relieves pain and inflammation. It also reduces fever by affecting some of the body’’s reactions. Aspirin is very irritating to the stomach lining. The best way is to chew the tablets before swallowing them with water, but few people can stand the bitter taste. Some people suggest crushing the tablets in milk or orange juice.

A good title for this passage would be:________

A．Why Do We Take Aspirin

B．How Do We Take Aspirin

C．Aspirin: The Unknown Side Effects.

D．Aspirin: The Most Popular Medicine.
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