问题 选择题

关于光的性质,下列说法正确的是

A.光在介质中的速度大于光在真空中的速度

B.双缝干涉说明光具有波动性

C.光在同种介质种沿直线传播

D.光的偏振现象说明光是纵波

答案

答案:B

    樊守青真空中光速最大,选项A错误。干涉现象、衍射现象、偏振现象都是波的特有属性,选项B正确。光在透明的同种均匀介质中沿直线传播,选项C错误(没有透明的条件是不行的)。偏振现象说明光是横波,选项D错误。

阅读理解

A Lesson from the Elder

Grandfather was an elder Cherokee Native American who had a wrinkled, nut brown face and kind dark eyes. His grandson often came in the evening to sit on his knee and asked the many questions that children would ask.

One day the grandson came to his grandfather with a look of anger on his face and the following story. “Father and I went to the store today and because I helped him, he bought me a present---a jack-knife. I went outside to wait for father and to admire my new knife in the sunlight. Some town boys came by and saw me. They surrounded me and started saying bad things. They called me dirty and stupid and said that I should not have such a fine knife. The largest of these boys pushed me back and I fell over one of the other boys. I dropped my knife and one of them picked it up and they all ran away laughing. I hate them. I hate them all."

The elder Cherokee, with eyes that had seen too much, lifted his grandson's face so his eyes looked into the boy's face. Grandfather said, "Let me tell you a story. I, too, at times, have felt a great hate for those who have taken so much with no sorrow for what they do. But hate wears you down and does not hurt your enemy. It is like drinking poison and wishing your enemy would die. I have struggled with these feelings many times. It is as if two wolves are inside me.... It is a terrible fight.

One wolf is good and does no harm. He lives in harmony with all around him and does not take offense when no offense was intended. It will only fight when it is right to do so and in the right way. This wolf stands for joy, peace, love, hope, sharing, modesty, kindness, friendship, sympathy, generosity, truth, and faith.

The other wolf is full of anger. The least thing will set off his fiercest temper. He fights everyone, all the time, for no reason. He cannot think because his anger and hate are so much. It is helpless anger, for his anger will change nothing. This wolf represents fear, envy, greed, self-pity, guilt, lies, false pride and superiority.

Sometimes, it is hard to live with these two wolves inside me for both of them try to control my spirit. This same fight is going on inside you and inside every other person too.”

The boy looked into his grandfather's eyes and asked, "Which wolf will win?" The old Cherokee simply replied.... "The one you feed."

小题1:The boy was angry because __________.

A. he was not satisfied with his present

his back was badly injured in a fight

he had waited for his father for too long

his jack-knife had been taken away by some boys

小题2:How does the good wolf do things in the story?

A.He never fights against others.

B.He tries to get on well with others.

C.It is hard for him to live with other wolves.

D.Sometimes he had a terrible fight because some one hit him.小题3:We can learn from the third paragraph that _________.

A. “hate” is healthy

B.“hate” hurts oneself

C. “hate” is complicated

D. “hate” harms one’s enemies小题4:What did Grandfather mean by saying "The one you feed" in the last paragraph?

A.We should feed the two wolves equally.

B.Living in harmony with others is important.

C.Our feelings should be expressed at the right time.

D.The choices we make determine who we will become.

单项选择题