2002年诺贝尔物理学奖中的一项,是奖励美国科学家贾科尼和日本科学家小柴晶俊发现

题型:选择题

问题:

2002年诺贝尔物理学奖中的一项,是奖励美国科学家贾科尼和日本科学家小柴晶俊发现了宇宙X射线源.X射线是一种高频电磁波,若X射线在真空中的波长为λ,以h表示普朗克常量,c表示真空的光速,以E和m分别表示X射线每个光子的能量和质量,则(  )

A.E=,m=0

B.E=,m=

C.E=,m=0

D.E=,m=

考点:X射线α、β、γ射线
题型:选择题

2012年7月,中国选手易思玲在女子十米气步枪决赛中获得冠军,为中国代表团夺得伦敦奥运会的第一枚金牌!下列对奥运金牌认识正确的是(   )

A.奥运金牌只要用于交换,就成为商品

B.奥运金牌的价值只能通过拍卖体现出来

C.奥运金牌的价格是由获得金牌付出的劳动量决定

D.奥运金牌属于贵金属货币,但不具有价值尺度职能

题型:选择题

Twenty years ago, I drove a taxi for a living. One night I went to pick up a passenger at 2:30 am. When I arrived to collect, I found the building was dark except for a single light in a ground floor window.

I walked to the door and knocked, “Just a minute,” answered a weak and elderly voice. After a long pause, the door opened. A small woman in her eighties stood before me. By her side was a small suitcase.

I took the suitcase to the car, and then returned to help the woman. She took my arm and we walked slowly towards the car.

She kept thanking me for my kindness. “It's nothing,” I told her. “I just try to treat my passengers the way I would want my mother treated.”

“Oh, you are such a good man.” She said. When we got into the taxi, she gave me an address, and then asked, “Could you drive through downtown?”

“It's not the shortest way,” I answered quickly.

“Oh, I'm in no hurry,” she said. “I'm on my way to a hospice (临终医院). I don't have any family left. The doctor says I don't have very long.”

I quietly reached over and shut off the meter (计价器).

For the next two hours, we drove through the city. She showed me the building where she had once worked, the neighborhood where she had lived, and the furniture shop that had once been a ballroom where she had gone dancing as a girl.

Sometimes she'd ask me to slow down in front of a special building and would sit staring into the darkness, saying nothing.

At dawn, she suddenly said, “I'm tired. Let's go now.”

We drove in silence to the address she had given me.

“How much do I owe you?” she asked.

“Nothing.” I said.

“You have to make a living,” she answered. “Oh, there are other passengers.” I answered.

Almost without thinking, I bent and gave her a hug. She held onto me tightly. Our hug ended with her remark, “You gave an old woman a little moment of joy.”

小题1:Why did the man help the old woman so much?

A.He wanted to get more money from the old woman.

B.He was out of patience with the woman and wanted to leave quicker.

C.The old woman asked him to help.

D.He hoped others could also treated his old mother as well as he did.小题2:The old woman chose to ride through the city in order to       .

A.show she was familiar with the city

B.see some places for the last time

C.let the driver earn more money

D.reach the destination on time小题3:According to the text, what would the old woman feel after the driver showed her around the city and gave her a warm hug?

A.Excited.

B.Shocked.

C.Grateful.

D.Upset.小题4:What can we learn from the story?

A.Giving is always a pleasure.

B.People should respect each other.

C.An act of kindness can bring people great joy.

D.People should learn to appreciate others' concern.

题型:选择题

下列说法中正确的是(  )

A.一群处于n=3能级的氢原子自发跃迁时能发出2种不同频率的光子

B.α粒子散射实验揭示了原子具有核式结构

C.核反应12H+13H→24He+01n属于原子核聚变

D.发生光电效应时,入射光越强,光子的能量就越大,遏止电压就越大

题型:选择题

饼图是利用圆形及圆内扇形的()来表示数值大小

A.面积

B.弧线长度

C.角度

D.颜色

题型:选择题

中国史前社会经历过一个集体生产、平均分配的农耕聚落阶段。能反映这种情景的是()

A.姜寨遗址

B.炎黄传说

C.二里头遗址

D.尧舜禹传说

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