题目

下列变化中属于化学变化的是（ ） A．食醋除水垢   B．干冰降雨 C．酒精挥发 D．石蜡熔化 答案：【考点】化学变化和物理变化的判别． 【专题】物质的变化与性质． 【分析】化学变化是指有新物质生成的变化，物理变化是指没有新物质生成的变化，化学变化和物理变化的本质区别是否有新物质生成；据此分析判断． 【解答】解：A、食醋除水垢过程中有新物质生成，属于化学变化． B、干冰降雨    In New York City,every year on Thanksgiving Day? firemen cook turkey for a soup kitchen in 125th Street in Harlem. At the same time,many people give all kinds of food,fruits,meat,juice and so on to the soup kitchen.     A woman called Mary opened this soup kitchen for homeless people. Sixteen years ago,she found all the restaurants were closed during the Thanksgiving holidays ? so many homeless people had to live on the food which restaurants left in the rubbish bins. Mary decided to cook food for those poor people. People heard about Mary's story and many of them joined her team.T     his year,on Thanksgiving Day,I had a chance to do something for the soup kitchen. When I got there,I was surprised to find many homeless people standing in line,waiting for free food. I was even more surprised when I found there was lots of food there. Of course,it was given by kind people.     From noon to half past two,I was busy putting food into a white box. Every time when I was handing out the box to homeless people,everyone said “thank you” to me.     Those “thank you” greatly touched me. As a young man,I enjoy healthy nice food and drink,so I should be thankful for everything I have now because I am lucky enough.() 1. Who opened the soup kitchen in New York City?   A. Mary.              B. The writer.   C. Homeless people.       D. Young people.() 2. How did the writer feel when he saw so many homeless people and somuch food?   A. Sad.    B. Happy.    C. Worried.     D. Surprised.() 3. The underlined word “touched” probably means “”   A. reached   B. moved   C. interested   D. hurt() 4. Which of the following is NOT true according to the passage?   A. The writer thinks he is lucky enough because he has enough to eat.   B. The writer invited many homeless people to his home on Thanksgiving Day.   C. All the homeless people were thankful when they got a box of food from the writer.   D. Many people do something for the soup kitchen on Thanksgiving Day.