问题 填空题

(6分)在图中,甲是用绳和木棍体验“滑轮组”威力的装置;乙是正在旋转着升降的滚摆;丙是用于“探究水和沙子吸热升温的属性”的装置.

(1)图甲证明了                                  ; 

(2)图乙说明了                                  ; 

(3)图丙的实验中用加热时间的长短表示物质                          

答案

(1)使用滑轮组可以省力(2)物体的动能和重力势能可相互转化,(3)吸收热量的多少

题目分析:(1)绳和木棍构成了一个“滑轮组”,滑轮组可以省力;

(2)当滚摆上升时,重力势能增加,动能减小,动能转化成重力势能;当滚摆下降时,重力势能减小,动能增加,重力势能转化成动能;

(3)在酒精灯提供的热量一定时,加热时间越长,物体吸收的热量就越多,这里应用到转换法。

阅读理解

One day a big cat was going into a forest to find something to eat. On his way he met his friend, the old owl(猫头鹰).  The owl greeted him, “Good morning, my dear friend. Where are you going?”  “I’m going to the forest to look for some birds to eat.” The cat answered. “But be careful not to catch any of my children.” The owl said to the cat. “OK,” the cat said. “But what do your children look like?” “Oh,” the owl said, “they are the most beautiful birds in the forest.”

“All right, I know that.” The cat said and walked on to the forest.

The cat entered the forest and saw many beautiful birds here and there. He remembered what the owl had told him and went away. Then after a long time, he saw some ugly birds in a nest. He sat down and ate them one by one. When the owl came back to her nest, she found it was empty.

小题1:The cat went to the forest            .

A.to meet his friend

B.because he was hungry

C.to see the tree

D.to visit the owl小题2:The old owl        the cat.

A.knew

B.ate

C.didn’t like

D.didn’t see小题3: When the cat saw the beautiful birds, he           .

A.didn’t eat any of them

B.ate only a few of them

C.caught some but let them go

D.ate all of them小题4:The old owl’s children were           .

A.beautiful

B.ugly

C.nice to the cat

D.the cat’s friends小题5:The owl’s nest was           .

A.near the cat’s home

B.in a small tree

C.on the ground

D.in the forest

单项选择题