问题 选择题

视觉的形成是 :外界物体反射的光线经过      ,由瞳孔进入眼球的内部再经过     等的折射作用,最终落在    上形成物像,物像刺激了       上的感光细胞,使感光细胞产生与视觉有关的信息,这些信息经过        传到大脑皮层的        中枢,形成了视觉。

答案

角膜、晶状体(或玻璃体)、视网膜、视网膜、视神经、视觉

视觉的形成过程是:外界物体反射来的光线,经过角膜、房水,由瞳孔进入眼球内部,再经过晶状体和玻璃体的折射作用,在视网膜上能形成清晰的物象,物象刺激了视网膜上的感光细胞,这些感光细胞产生的神经冲动,沿着视神经传到大脑皮层的视觉中枢,就形成视觉。

阅读理解

阅读理解

       One night when I was in bed, I got up for some water.  I heard a strange noise.  I lookcd out of my

window and saw a big flying object ! Then I heard a strange sound.  jmped up and  ran to the door.  The

flying object was there and its lights were hiking.

       I watched and Saw a strange door open on one side of the flying object.  There were colorful lights

around the door and a bright light coming from the inside.  Then I found something moving around.  Then

I saw two bright green eyes in the door way.  They began moving towards me.  An alien walked a few

steps away from the object.  The alien was tall and skinny.  His eyes were very big and glowed green in

the dark.  He was not scary looking.  He seemed friendly.  I was not afraid.

       The alien saw my cats, but they got scared and ran away.  Then he made a .soft sound and the cats

ran back to see Jim.  It was very funny.  I laughed and the zilien heard me.  He started to walk towards

me.  I said:"Hello,  how are you? " He didn't answer,  but he made that same sound.

       Then, he turned and walked towards the garden.  He picked some flowers for simples totakehome

with him.  He smelled them and sneezed very loud. This woke up my parents andthe neighbors.  

Everyone came to find out what the noise was.  When they saw the alien, theywere a little scared,  

especially the kids.  The alien was hai)py that we were all there to see him. He made some  noise turned

around and walked towards the flying object with the flowers.

1. How did the writer feel when he saw the alien?            

A. Anxious.      

B. Interested.    

C. Worried.    

D. Excited.

2. Which of the following is TRUE?            

A. The alien was afraid of the writer.            

B. The alien understood the writer's language.            

C. The alien was tall and had two green eyes.            

D. The UFO made no noise when it landed.

3. What does the underlined word "samples" mean in Chinese?            

A. 测试        

B. 证件    

C. 样品      

D. 礼物

4. What can we infer from the passage?              

A. The alien was more interested in animals than in plants.              

B. The writer would forget this experience soon.              

C. The alien was afraid to see the writer's neighbors.              

D. The alien didn't know much about the flowers on the earth.

5. What's the best title for the passage?            

A. My UFO Story                      

B. Are there Real Aliens            

C. Aliens and Flowers                  

D. My Dream of Meeting Aliens

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