问题 选择题

原子结构模型的演变:①道尔顿实心球式原子模型;  ②卢瑟福行星运转式原子模型;③汤姆孙葡萄干面包式原子模型;④近代量子力学原子模型;⑤玻尔轨道式原子模型.下列排序符合历史演变顺序的是(  )

A.①③②⑤④

B.①②③④⑤

C.①⑤③②④

D.①③⑤④②

答案

①19世纪初,英国科学家道尔顿提出近代原子学说,他认为原子是微小的不可分割的实心球体.

②1911年英国物理学家卢瑟福(汤姆生的学生)提出了带核的原子结构模型.

③1897年,英国科学家汤姆生发现了电子,1904年提出“葡萄干面包式”的原子结构模型.

④奥地利物理学家薛定谔提出电子云模型(几率说),为近代量子力学原子模型.

⑤1913年丹麦物理学家波尔(卢瑟福的学生)引入量子论观点,提出电子在一定轨道上运动的原子结构模型.

故选A.

阅读理解

阅读短文,判断正(T)误(F)。

      I have been a news reporter for the past fifteen years. The job has taught me many unforgettable lessons. I

have seen wars, poverty and death, but I have also seen courage (勇气), hope and happiness.

      In India, I saw many homeless children. Some were as young as four year old. They lived in the streets

begging (乞讨) or stealing. But then a wonderful lady called Rosa opened a home for them. Within one year she

was looking after two hundred children. She clothed them, fed them and taught them. She gave them hope.

      Another time, I was in Turkey after a terrible earthquake. I found an old lady whose house was broke down.

Her son was missing and people said there was no chance that he was still alive. But the lady did not give up

hope. For four days, she moved heavy stones one at a time. She did not stop until she found her son. He was

alive.

      Here in China, I was surprised when I met a young boy who had had twenty operations and spent nearly his

whole life in hospital. I thought he would be sad, but when I met him, his smile was so warm and welcoming.

      In life, we need models that we can learn from. When my life is difficult, I try to remember the courage and

goodness of these three people.

( ) 1. The underlined word "poverty" probably means the state of being poor.

( ) 2. A man was looking after two hundred children.

( ) 3. The old lady's son was saved by some people.

( ) 4. The speaker was surprised while meeting the sick boy because he was in hospital all his life.

( ) 5. The main purpose of the speaker is to ask people to live with hope and courage.

单项选择题