Unit 7 How do things change? 课时练习1 Get ready (含答案，含听力原文，无听力音频)

Unit 7 How do things change？ 课时练习1Get ready 主题情境 周末同学们来到公园野餐，在公园都发生了什么事情呢？ 一、野餐时同学们在讨论些什么呢？听句子，用数字1-5给图片排序。 二、野餐后，同学们在公园发现了很多东西，它们都属于哪种物质形态呢？请给物品进行分类，将序号写在对应横线上。 1.gas：_____2.liquid：_____3.solid：_____ 三、之后同学们讨论生活中一些现象的因果关系。请将对应的原因和结果连线。 Cause Effect 1.We eat some food. A.We can see some gases. 2.We heat some water. B.I feel cool. 3.Salt can speed up(加速) C.We go out safely in winter. the melting of snow. 4.I drink ice water. D.We are not hungry. 四、回家后蓝蓝写了一篇野餐日记。请根据图片选词，并用其适当形式填空，补全日记。 We have a magic picnic today！ My ice cream is a 1._____at first. But after 5minutes in the sun，it begins to 2._____. My juice stays a 3._____in the cup. When I open the thermos(保温杯)，I see some 4._____coming out. It is interesting to see these changes！ 五、典典打算为家人制作早饭。阅读操作步骤，判断句子正(T)误(F)。 It is the second Sunday of May. Diandian wants to make breakfast for his family.He is reading some tips in the kitchen. (　) 1.Today is Mother's Day. (　) 2.Diandian needs three pieces of bread to make the sandwich. (　) 3.There are six steps. (　) 4.Diandian should wash the tomato and lettuce first. (　) 5.Finally，Diandian needs to cut the sandwich in half. 六、Tom在厨房观察到了哪些现象呢？阅读短文，补全表格。 Tom watches his mother cook.He sees many changes.The butter(黄油) in the pan(平底锅) is a solid.When the pan gets hot，the butter melts. It becomes a liquid.The water in the pot is boiling(煮沸). Steam comes out.Steam is a gas.Later，Tom takes an ice cube from the freezer.The ice cube is a solid.He puts it on the table.After some time，the ice cube becomes smaller，and there is water under it.It is melting.Tom also sees the sugar disappear(消失)in his tea.It mixes with the hot liquid. 七、典典在网站上看到了一篇介绍水的文章。阅读短文，选择正确选项。 Water is our best friend.It has no colour，smell or fixed(固定的) shape，and it is everywhere.All living things need water—people drink it，animals swim in it，and plants use it to grow. Water can change itself.When it is cold，water becomes ice and feels hard.When it is warm，water flows like a river.When water is boiling，it becomes steam and goes up to make clouds. We find water in the sea，lakes，rain and even inside fruits.We use it to wash，cook and help flowers smile.Remember：every drop of water is special.Let's use it wisely(明智地)！ (　　) 1.Who needs water？ A.Only people. B.All living things. C.Only plants. (　　) 2.Water turns into steam when it is_____. A.very cold B.warm C.boiling (　　) 3.Where can we find water？ A.Only in rivers. B.In the sea，lakes，rain and even fruits. C.Only inside houses. (　　) 4.What does water become in the sky？ A.Ice. B.Clouds. C.Snow. (　　) 5.Why should we save water？ A.Because it has no smell. B.Because every drop of water is precious(珍贵的). C.Because it i ... ...