2．Von Neumann published his first book at the age of ．

　　A．23　　　　　　 B．26

　　C．29 D．32

　　C　[推理判断题。根据第一段"In 1926，at 23..."和第二段"His first book was published in 1932"不难得出，他29岁时出版了第一本书。]

　　3．How did World War Ⅱ affect John von Neumann?

　　A．He realized the importance of engineering.

　　B．He began to research how to put mathematics into practice.

　　C．He left college and served at the government department.

　　D．He lost interest in chemistry.

　　B　[细节理解题。根据第三段前三句可知，二战使他的兴趣从纯粹数学领域转到了应用数学领域。]

　　4．From the last paragraph，we can infer John von Neumann was ．

　　A．calm B．brave

　　C．intelligent D．humorous

　　D　[推理判断题。他在描述自己的事故时，将自己与树木之间的动与静的状态颠倒，让人忍俊不禁，由此可见他很幽默。]

　　B

　　Alzheimer's disease(老年痴呆症) affects millions of people around the world.American researchers say the disease will affect more than one hundred million people worldwide by the year 2050.That would be four times the current number.Researchers and doctors have been studying Alzheimer's patients for a century.Yet the cause and the cure for the mental sickness are still unknown.However，some researchers have made important steps towards understanding it．

Several early signs of the disease involve memory and thought processes.At first，patients have trouble remembering little things.Later，they have trouble remembering more important things，such as the names of their children.