问题 选择题

   下列变化中,前者是物理变化,后者是化学变化的是

A.葡萄酿酒、食物霉变

B.汽油挥发、胆矾研碎

C.美酒飘香、铁锅生锈

D.水的电解、干冰升华

答案

答案:C

题目分析:物理变化是没有新物质生成的变化,化学变化是有新物质生成的变化A选项中都为化学变化;B选项都为物理变化;C选项前为物理变化,后为化学变化答案选择C;D选项前为化学变化,后为物理变化.

阅读理解

阅读理解。

     It's 7:45 in the morning, and 26-year-old Steve Clarkson is going to work. He puts on his jacket,

and picks up his mobile phone and laptop. As he leaves the house, he turns on his MP3 player and puts

on his headphone. He is ready to go.

     Today, for millions of people, gadgets like Clarkson's are a normal part of life.  "I'm a reporter for a

magazine, and I'm usually not in the office. My mobile phone and laptop help me to do my work both

on the road and at home," says Clarkson. Today many people can check e-mails, send messages, or

surf  the Web, using their mobile phones.

     Tina Fang is studying photography in New York City.  "Some of these gadgets are expensive, but

they can save your money in the long run. I have a digital camera. l can use it to take eighty pictures and

shoot video ( record an image onto video) at the same time. I listen to music on my MP3 player, and I

can download and read books on it, too. I use the camera and MP3 for both learning and fun. "

     It's now 9: 45. Steve Clarkson gets e-mails from his 17-year-old sister. She has a gadget that lets

her send e-mails, play games, and take notes. She is in class right now. "I e-mailed her back. I told her

to stop playing, and pay attention, "laughs Clarkson.  "These gadgets are fun, but sometimes they can 

distract (分散注意力) people, too."

l. What is Steve Clarkson?

A. A student.

B. A reporter.

C. A businessman.

D. A computer programmer.

2. Which of the following things is not a gadget?

A. A picture.          

B. A laptop.

C. An MP3 player.    

D. A mobile phone.

3. When his sister had lessons, Steve told her _________.

A. to pay no attention

B. to e-mail him back right away

C. to stop playing games

D. to listen to music on the MP3 player

单项选择题