问题 选择题

当手偶然触到一个温度很高的物体时,产生的现象是(  )

A.因烫而缩手

B.只是缩手

C.缩手后才觉得烫

D.缩手和烫觉同时发生

答案

神经调节的基本方式是反射,反射活动的结构基础是反射弧,包括感受器、传入神经、神经中枢、传出神经和效应器.反射必须通过反射弧来完成,当手偶然触到一个温度很高的物体时,信息通过传入神经传递给脊髓,脊髓接到信息后,一边传出指令让手缩回,一边将此信息传给大脑,而前者比后者传递地快,所以缩手后才觉得烫.而产生烫的中枢在大脑皮层的躯体感觉中枢.因此,选项A、B、D均不符合题意.

故选:C

单项选择题
阅读理解

阅读理解

     It may happen sooner or later:when books, toys, songs, snacks, video games, and DVDs have lost

their charm, your child begins to say, "I'm bored!Tell me a story, please."Your mind goes blank and your

child looks at you with great expectation.What should you do?

     You may not realize it, but you have a wealth of stories to share.Personal stories, particularly from your childhood or from books you've read, are good starters.

     Some kids enjoy stories about characters from their favorite books.Whether you take Little Chick on a walk through the barnyard or Firefighter Bob on an exciting drive through the city, don't worry too

much about plot(故事情节). Young kids will enjoy them very much.

     Some kids can appreciate a funny twist, so take a favorite story and turn it upside down by changing

the setting, characters, or plot.Make your child the main character in a funny adventure that fits his

interests.

     When did you lose your first tooth? Who was a favorite teacher of yours? Thinking about Mommy or Daddy as a little kid may excite the imagination.And there's nothing more delightful than a story about the

time a parent did some tricks and their results.Kids delight in these short experiences of a past that are

connected to them.

     When you tell stories, you show how to put words together to make meaning.You share something

new about yourself that your kids may find interesting or exciting and that might be a starting point for

questions and discussions.Above all, you develop a love of words that kids will have for life.

     So take a deep breath and begin:"Once upon a time..."

1. At present most children probably have the least chances to________.

A. watch video games  

B. play with toys

C. have snacks  

D. listen to stories

2. To tell children stories, parents are advised to________.

A. use their imagination to invent some stories

B. learn about their children's interests

C. depend on wide reading

D. choose wellorganized stories in terms of plot

3. From the passage we learn that________.

A. children enjoy hearing stories about their parents

B. children can develop an adventurous spirit by listening to stories

C. children sometimes like to see their parents make mistakes

D. parents can learn to tell lies by telling their children stories

4. What is the biggest benefit that children can get by listening to stories?

A. It shortens the distance between parents and children.

B. It develops the imagination of children.

C. It develops children's love for language.

D. It encourages children to question things.