问题 选择题

关于光的折射现象,下列说法中正确的是(  )

A.光从空气进入水中,传播方向一定发生改变

B.光从空气进入水中,折射光线一定向水面偏折

C.光从水进入空气中,传播方向不一定发生改变

D.光从水进入空气中,折射光线一定向法线偏折

答案

由光的折射定律可知:当光从空气斜射入水或其他介质中时,折射光线与入射光线和法线在同一平面内,折射光线与入射光线分居法线两侧;折射角小于入射角;当入射角增大时,折射角也随着增大;

因为当光线垂直射向介质表面时,传播方向不改变;

当光从空气中斜射入水中时,折射光线向法线方向偏折;

而当光从水中斜射入空气中时,折射光线远离法线方向.所以选项A、B、D错误,选项C正确.

故选C.

阅读理解

阅读理解。

     One of this summer's hottest books is "That Guy Was Cool." Sounds like a great book for kids, doesn't

it? But parents and teachers want to read this one, too. It can teach them something about the language of

today's kids.

      So lots of people, young and old, went to see the book's author, 19-year-old Korean girl Guiyeoni, on

Saturday. She was in Beijing to sign books for her fans.

      "Guiyeoni wrote a story that is near to us and goes to our hearts," said a Junior 2 student in Beijing.

"When I read it, I laughed and I cried." Like the "Meteor Garden" TV series (系列), "That Guy Was Cool"

tells an unusual story of love between two students. The girl is sweet, but she's just average (一般的).

The boy is good-looking and has everything, but he is often unhappy because his father died when he

was very young. They become close and help each other to be happy. In the end, they fall in love.

     "The girl in the book is like me. She's simple and moody," said Guiyeoni.

     Guiyeoni's book doesn't only use words. It also uses things like emoticons. Emoticons are small icons,

like smiling faces, and they are used to show emotions. Kids know what these things mean, because they

often use them when they talk on the Internet or send messages with mobile phones.

     Guiyeoni said she wrote this way because of her young readers. "Writing with pictures is vivid and

can say a lot of things," she said.

     Guiyeoni began writing the book's story on the Web in 2001 when she was a Senior 2 student. Last year,

she put that online story together to make this book. "That Guy Was Cool" has been made into a film, and it

will come out in Korea next month.

     This is Guiyeoni's first of four books, and she hopes to keep writing as she goes through college.

     She also has a message for young writers. "I think that if they try hard, lots of young people can do this."

1. Guiyeoni is _____. [ ]

A. a girl who falls in love with her classmate.

B. the writer of "Meteor Garden."

C. a young writer

D. one of the emotions.

2. which of the following may Not be an emotion? [ ]

A. 8-)

B. See you.

C. Good bye!

D. Hello!

3. The author used emoticons to write the book because _____. [ ]

A. she really likes them

B. she wants her young readers to be interested

C. pictures can say lots of things

D. she was only a Senior student when she was writing the story

4. Parents like to read this book because _____. [ ]

A. it's interesting and vivid

B. of the way the author wrote the story

C. the story goes to their heart.

D. it's helpful for them to know about their children better.

5. Which of the following sayings has the closest meaning to 

    "I think that if they try hard, lots of young people can do this"? [ ]

A. Seeing is believing.

B. Time flies.

C. No news is good news.

D. Where there is a will, there is a way.

填空题