问题 选择题

下列有关物质的化学式、名称、俗名不完全对应的是(  )

A.CaCO3 碳酸钙    生石灰

B.NaHCO3 碳酸氢钠    小苏打

C.Na2CO3 碳酸钠    纯碱

D.NaCl    氯化钠   食盐

答案

A、石灰石的主要成分是碳酸钙,生石灰是氧化钙的俗称,其化学式、名称、俗名对应不一致.

B、碳酸氢钠的俗称是小苏打,其化学式为NaHCO3,其化学式、名称、俗名对应一致.

C、碳酸钠俗称纯碱、苏打,其化学式为Na2CO3,其化学式、名称、俗名对应一致.

D、氯化钠的俗称是食盐,其化学式为NaCl,其化学式、名称、俗名对应一致.

故选A.

阅读理解

阅读理解。

     Helen Keller lived in the U.S.A. She was a great woman.

     When Helen was a baby, she got very sick. After many weeks, the doctor said," She is better, but now

she can't see or can't hear." Her mother and father were very sad.

     After a few years, things got worse. There was no way for Helen to speak with other people. She heard

nothing. She saw nothing. She didn't understand anything.

      Then one day a teacher came to live with Helen and her family. The teacher helped Helen learn about

words. Helen was a very bright child and soon she learned to spell her first word. When she was older, she

went to college (大学).

      Helen was very famous. She helped many blind(盲) and deaf (聋) people. She traveled around the world

and helped many people.

      Helen was a very old woman when she died. The world remembers her today as a brave and wonderful

person. She was blind and deaf, but she found a way to see and hear.

1. Helen Keller got very sick when _______.

A. she was a baby

B. she went to college

C. her teacher came to her home

D. she was very old

2. _______ taught Helen Keller her first word.

A. Her mother

B. Her teacher

C. Her father

D. The doctor

3. Helen Keller was famous because _______.

A she was an American

B she traveled around the world

C her teacher taught her many things

D she learned to read and write and helped many people in the word

4. The world remembers Helen Keller today because ______ .

A. she was very bright.

B. she was blind and deaf.

C. she was a brave and wonderful person.

D. she went to college.

5. Helen Keller was blind and deaf, but _______.

A. she found a way to understand the world.

B. her mother and father didn't feel sad.

C. she found a way to travel around the world.

D. she found out how people became blind and deaf.

单项选择题