问题 选择题

下面列举的现象中,由于做功使物体的内能发生改变的是(  )

A.酒精涂在手背上觉得凉

B.把铁钉钉进墙里,铁钉变热

C.水被太阳晒热

D.烧红的铁块放在冷水中,铁块温度降低

答案

A、酒精蒸发从手上吸热,使手的内能减少、温度降低,发生了热传递,不符合题意;

B、把铁钉钉进墙里,对铁钉做功,消耗机械能转化为铁钉的内能,使铁钉的内能增加、温度升高,是利用做功的方法改变内能,符合题意;

C、水被太阳晒热,是水从太阳吸热,使水的内能增加、温度升高,发生了热传递,不符合题意;

D、烧红的铁块放在冷水中,铁块放热、内能减少、温度降低,水吸热、内能增加、温度升高,发生了热传递,不符合题意.

故选B.

阅读理解

阅读理解。

     Jimmy lives in the country(乡村), and he loves playing in the river near his house, but his father gets a job in a big city(城市), and he moves there with his family.

     Their new house has a garden, but the garden is very small. Jimmy isn’t happy. “Is there a river near

here?” He’s asking his mother in the first morning. His mother is answering, “No, there isn’t, but there’s a

nice park near here, and there’s a pool(池塘)in it. We’re going there this afternoon.” Jimmy is happy

now.

     After lunch, Jimmy and his mother go to the park. Jimmy wants to walk near the pool, but there is a

sign(牌子)beside it. His mother reads it to him, “Warning(注意):This pool is dangerous.367 people have fallen into it(已掉进池塘).”Jimmy looks into the pool carefully. And he says, “But I can’t see

them.”

1. There is____ near Jimmy’s old house.

A. a sign

B. a garden

C. a river

D. a park

2. Jimmy moves to a big city because ______.

A. he likes the big city

B. their new house in the big city has a nice garden

C. there is a pool in the garden

D. his father gets a job in the big city

3. Jimmy becomes happy because______.

A. he’s going to the park with a pool in it

B. he’s going to play in the river

C. he’s going to see their nice garden

D. he’s going to play with some new friends

4. The sign tells people_______.

A. the water in the pool is dirty(脏)

B. not to look at the pool

C. to jump into the pool

D. not to walk near the pool

5. Which is wrong?

A. Jimmy’s father has a new job

B. Jimmy likes the river

C. 367 people has fallen into the pool

D. Jimmy can’t see the people in the pool, because something is wrong with his eyes

单项选择题 配伍题