问题 选择题

睫状体内的平滑肌的舒缩能引起(  )

A.瞳孔大小的变化

B.眼球前后径的变化

C.晶状体曲度的变化

D.视网膜感光能力的变化

答案

当睫状体放松时,晶状体比较薄对光的偏折能力变小,远处物体射来的光刚好会聚在视网膜上,眼球可以看清远处的物体;当睫状体收缩时,晶状体变厚,对光的偏折能力变大,近处物体射来的光会聚在视网膜上,眼睛就可以看清近处的物体.故眼睛的睫状体的作用是调节晶状体的曲度,若睫状体这种功能消退,将无法调节晶状体的形状,眼镜观看各处景物时视网膜上成像不清晰.瞳孔大小的变化受光线强弱的影响,

故选C

阅读理解

根据短文内容。完成下面的句子。每空一词。(每小题2分,共10分)

It was a cold day in December in New York City. A little boy about ten years old was standing in front of a shoe store on Broadway. He was looking through the window, bare footed and shaking with cold. A lady walked to the boy and said, "My little boy, what are you looking at?  I was asking God to give me a pair of shoes. " was the boy's reply.

The lady took him by the hand and went into the store. She asked the clerk to get a pair of socks for the boy. She then asked if he could give her a basin of hot water and a towel. The clerk quickly brought them to her. She removed her gloves, knelt down, washed the boy's little feet, and dried them with a towel. By this time, the clerk had returned with the socks. The lady put on the socks for the boy, and then bought a pair of shoes for him. She patted him on the head and said, "My little boy, do you feel more comfortable now?"

As the lady turned to go, the boy caught her by the hand suddenly and looked up in her face.

With tears in his eyes, he asked her, "Are you God's wife?  No, I'm a mother," said the lady.

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小题1:The story            in New York on a            day in December.

小题2:The little boy ____________ in from of a shoe store and looked forward to _______ a pair of shoes.

小题3:The lady             the little boy by the hand and             the store.

小题4: The lady            the little boy            he felt more comfortable.

小题5: The lady was so             that she was             as "God's wife" by the little boy.

单项选择题