题目内容
【题目】Amazing chemistry experiment (化学实验)
Things you need: a cup some water ice cube (小方冰块) string (线) salt
Steps:
Firstly, fill a cup with water. Put an ice cube into the water.
Secondly, carefully put the string so that it lies(躺)on the top of the ice cube.
Thirdly, when the string touches (接触) the ice cube, ask your friend to add some salt on the ice cube.
Finally, wait for one minute. Then carefully lift(提)the ice cube from the water by picking up the string.
Why does it happen?
Salt can make ice melt (融化). Adding some salt on the ice cube makes a little puddle (水坑) of melted ice. While you wait, the ice cube freezes (凝固) the puddle around the string. Now the ice cube “sticks to” the string so you can lift up(提起)the ice cube.
【1】Which of the following things don’t you need in this experiment?
A.knifeB.waterC.string
【2】What do you need to add to the ice cube in this experiment?
A.water.B.salt.C.air.
【3】The underlined(划线的) phrase “sticks to” means “ ” in Chinese.
A.碰到B.分离C.粘住
【4】Which of the following is TRUE?
A.Salt can’t make ice melt.
B.You should put the string into the water.
C.You should add some salt on the ice cube.
【答案】
【1】A
【2】B
【3】C
【4】C
【解析】
文章描述了用线把冰块提起来的实验。
【1】细节理解题。由文中“Things you need: a cup some water ice cube (小方冰块) string (线) salt”可排除B和C选项,故选A。
【2】细节理解题。由文中“ask your friend to add some salt on the ice cube.”可知,故选B。
【3】词句猜测题。由文中“so you can lift up(提起)the ice cube”所以你就可以提起冰块了,可以推测出是粘住了,故选C。
【4】细节理解题。由文中“Salt can make ice melt”可推测出A项错误;由文中“carefully put the string so that it lies(躺)on the top of the ice cube”是把线放在冰块上面,而不是水里,可推测出B项错误;由文中“ask your friend to add some salt on the ice cube”与C项符合,故选C。
【题目】阅读下列短文, 根据短文信息完成文后表格, 每空一词。
A report in a newspaper says that school accidents, such as food poisoning(食物中毒), fires, electricity and traffic, kill more primary and middle school students than any other things. So we must learn how to protect ourselves better. Here are some tips for keeping safety in mind every day.
When we're on our way home or to school . Wait for the green traffic light, and look left and right before we cross the road. We'd better wear bright-color clothes, so the drivers can see us easily. Don't believe the people we don't know in the street.
When we're in the school activity . When students around us begin to push each other, it's necessary for us to stand still and try to hold onto something, or stay in a corner until the crowd leaves. If we fall down in a moving crowd, use our hands to cover the head. Lean to one side, curl up(蜷缩)our body and bend(使弯曲)the legs.
When we meet a fire. Stay calm. Leave the classroom quickly with the help of the teachers. Smoke can be more dangerous than fire, so we should use a piece of wet cloth to cover our mouth and nose. What will we do if the clothes burn? Remember not to run! Drop and fall to the ground.
Then roll! It will make the fire go out.
When we eat . Wash fruits carefully before eating them. Check the expiration dates(保质期)on the packages of the snacks, and if it looks or smells bad, don't eat it.
Topic: Keep Safety in Mind every day | ||
Fact | It's reported that school accidents kill more students than anything 【1】. | |
Safety 【2】 | On the way | Wait for the green light, look 【3】 sides before we cross the road. Wear bright colours so that the drivers can see us easily. Don't believe 【4】 people in the street. |
At school | Stand still and try to hold onto something, or stay in a 【5】 until the crowd leaves. Cover our head with hands, leaning to one side, curing up our body and bending our legs. | |
In a fire | Stay calm. Follow the 【6】 and leave quickly. Cover our mouth and nose with a piece of 【7】 cloth. Drop to the ground and roll over and over put out the fire. | |
While 【8】 | Wash fruits carefully before we eat them. Check the expiration dates. Don't eat the 【9】 food. | |
Purpose | To teach the students how to keep away from 【10】. | |