问题 选择题

下列说法中正确的是(  )

A.一桶水比一杯水的比热大

B.质量为2千克10℃时的水含有的热量等于质量为1千克20℃时的水所含的热量

C.同种物质的质量变化时,其比热不变

D.比热大的物体,每升高1℃吸收的热量一定多

答案

A、比热容是物质的一种特性,与物体的多少没有关系;

B、热量表示在热传递过程中传递内能的多少,只能用吸收或放出来表述,不能说含有;

C、比热容与物体的质量大小无关;

D、比热容大的物体,在质量相同时,升高1℃吸收的热量一定高.

故选C.

阅读理解

阅读理解。

     Helen Keller was a very clever and beautiful girl. At the age of six months she could already say a few

words. But before she was two years old, she was badly ill. She could not see or hear, and soon, she could

not even talk, then Helen had to fight for what she wanted.

     When she was six, her parents invited a teacher for her. With the help of the teacher, she began to see

and hear the world around her through her hands. She learned to read the books for the blind (盲人). The

teacher took Helen for long walks, and told her about all the beautiful sights. Helen touched flowers, climbed

trees, and smelled a storm before it came. She also learned how to swim and ride a horse.

     After she grew up, she became a famous writer in America. Her first and most famous book is The Story

of My life. Her story has brought new hope to many blind and deaf people . It gave light to those in Darkness

and encouraged them to live and work.

1. When could Helen Keller already say a few words? [ ]

A. At the age of two.

B. At the age of a year and a half.

C. At the age of six months.

D. When she was six years old.

2. Why couldn't Helen see or hear later? [ ]

A. Helen was badly ill.

B. She had a traffic accident.

C. Helen was very tired.

D. She became very lazy.

3. How could Helen begin to see and hear the world around her? [ ]

A. With the help of her father.

B. She could see and hear the world around her through her feet.

C. With the help of her parents.

D. With the help of her teacher she could begin to see and hear through her hands.

4. After Helen grew up she became a famous _____. [ ]

A. doctor

B. scientist

C. singer

D. writer

5. What gave light to those in darkness and encouraged them to live and work? [ ]

A. The teacher's help.

B. The parents' help.

C. Helen's story.

D. Helen's songs.

单项选择题