问题 阅读理解

Once upon a time there was a wise man that used to go to the sea to do his writing. He had a habit of walking on the beach before he began his work. One day he was walking along the shore. As he looked down at the beach, he saw a human figure moving like a dancer. He smiled to himself at the thought that someone would dance on the beach. So he began to walk faster to catch up. As he got closer, he saw that it was a young man and the young man wasn’t dancing, but instead he was reaching down to the shore, picking up something and very gently throwing it into the ocean. As he got closer, he called out, “Good morning! What are you doing?’’

The young man paused, looked up and replied, “Throwing starfishes(海星)in the ocean.”

“I guess I should have asked, why are you throwing starfishes in the ocean?”

“The sun is up and the tide is going out. And if I don’t throw them in, they’ll die”

“But, young man, don’t you realize that there are miles and miles of beach and starfishes all along it. You can’t possibly make a difference!”

The young man listened politely. Then he bent down, picked another starfish and threw it into the sea, and said, “It made a difference for that one.” There is something very special in each and every one of us. We have all been gifted with the ability to make a difference. And if we can know that gift, we will gain through the strength of our vision of the power (力量) to shape the future.

We must each find our starfish. And if we throw our starfish wisely and well, the world will be better.

72.One day, the wise man saw a young man _______.

A.dancing along the beach     

B.walking with a dancer

C.picking up starfish for sale

D.trying to save as many starfishes as possible

73.The underlined words “something very special” refers to ________.

A.the gifts from friends      B.the strength of making decision

C.our own starfish            D.the ability to make a difference

74.From the last two paragraphs, we can learn that ________.

A.the wise man realized something new and important

B.the wise man thought it was foolish of the young man to throw starfishes in the ocean.

C.the young man had the ability to make a difference

D.it is necessary for us to save starfish on the beach

75.The writer told this story to show us _____.

A.how and where we can write a good article

B.everyone can do something for the future

C.wise men are sometimes stupid

D.young men are in fact wiser than old people  

答案

72—75 DDAB

计算题

(18分)

(1)如图9所示为“验证碰撞中的动量守恒”的实验装置。

①下列说法中不符合本实验要求的是        。 (选填选项前面的字母)

A.入射球比靶球质量大或者小均可,但二者的赢径必须相同

B.在同一组实验的不同碰撞中,每次入射球必须从同一高度由静止释放

C.安装轨道时末端必须水平

D.需要的测量仪器有天平和刻度尺

②实验中记录了轨道末端在记录纸上的竖直投影为O点,经多次释放入射球,在记录纸上找到了两球的平均落点位置MPN,并测得它们到O点的距离分别为。已知入射球的质量为,靶球的量为,如果测得近似等于       ,则可认为成功验证了碰撞中的动量守恒。

(2)用一段长为80cm的金属丝做“测定金属的电阻率”的实验。

①用多用表粗测电阻丝的电阻,结果如图10所示,由此可知电阻丝电阻的测量值约为

       

②用螺旋测微器测量金属丝的直径,结果如图11所示,由此可知金属丝直径的测量结果为

      mm。

③在用电压表和电流表测金属丝的电阻时,提供下列供选择的器材:

A.直流电源(电动势约为4.5V,内阻很小)

B.电压表(量程0~3V,内阻约3k)

C.电压表(量程0~15V,内阻约15k)

D.电流表(量程0~0.6A,内阻约0.125)

E.电流表(量程0~3A,内阻约0.025)

F.滑动变阻器(阻值范围0~15,最大允许电流1A)

G.滑动变阻器(阻值范围0~200,最大允许电流2A)

H.开关、导线。

要求有较高的测量精度,并能测得多组数据,在供选择的器材中,电流表应选择     ,电压表应选择     ,滑动变阻器应选择     。(填字母代号)

④根据上面选择器材,完成图12中实验电路的连接。

单项选择题