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Unit 7 How do things change单元练习题
（一）语言知识
【语音练习】
I. Read and judge （判断下列划线部分的发音是否相同，相同的用“T”表示，不相同的用“F”表示）
( ) 1. fresh flash ( ) 2. freeze frozen ( ) 3. flag frog
【词汇练习】
I. Read and write （读句子，根据图片提示，填入单词）
1. Water can be a ______, a ______, or a ______.
When water freezes, it becomes ______. When ice ______, it becomes water again.
3. We can make ______ with cream, sugar and salt.
【语法练习】
I. Read and write （用所给单词的适当形式填空）
1. Water ______ (freeze) when it is very cold. Ice ______ (melt) when it is warm.
2. Let’s ______ (put) the juice into the freezer.
3. —Shall we______ (add) some chocolate into the mixture —Sure.
（二）语言能力
理解
【听力练习】
I. Listen and choose (听录音，选出听到的单词)
( ) 1. A. steam B. freeze C. melt
( ) 2. A. mixture B. solid C. liquid
( ) 3. A. shake B. pour C. mix
II. Listen and choose (听录音，选出听到的句子)
( ) 1. A. Water freezes when it’s cold. B. Ice melts when it’s warm.
C. Water boils when it’s hot.
( ) 2. A. Let’s make some ice cream. B. Let’s make some juice.
C. Let’s make some soup.
( ) 3. A. Shall we mix the sugar and cream first B. Shall we put some salt in the soup
C. Shall we put some sugar in the coffee
III. Listen and choose （听一听，选出正确的应答句）
( ) 1. A. A liquid. B. A solid. C. A gas.
( ) 2. A. Shall we cut the orange first
B. Shall we cut the tomatoes and add some sugar first
C. Shall we wash the carrots first
( ) 3. A. Some chicken, a carrot and some salt.
Sugar, salt, cream, ice and chocolate.
The water and ice.
【阅读练习】
I. Read and judge. Then correct the false statements.（阅读短文，思考因果关系并判断正误，在横线上更正错误的部分）
Hot springs
Hot springs are small lakes with hot water. In some hot springs, the hot rocks at the bottom of the spring heat the water. In others, the water heats up under ground.
When the water is very hot, some of it changes to steam. The water was a liquid, and now it’s steam, a gas.
When hot steam meets warm air, we can’t see a lot of steam. When hot steam meets very cold air, we can see a lot of steam.
Be careful in hot springs! The hot water and hot steam can be dangerous.
表达
【口语练习】
I. Look and say（看图，根据图意和所给提示说一说）
Everything in our world is a ..., a ... or a ... Things can be mixed together to make something new. ... is a mixture of ... Things can change from one state to another when we make them hot or cold. When we boil the water, it changes into ... When we put the water in the freezer, it ... When it’s hot, the ice ...
【写话练习】
I. Think and write （你最喜欢什么混合美食？请你根据思维导图想一想并写一写）
My favourite mixture is ________________. I put ________________________________ together. I ___________________________________. I ___________________________________. I ___________the mixture. It looks/smells/ tastes __________________.
参考答案
（一）语言知识
【语音练习】
I. 答案：1. F 2. T 3. F
【词汇练习】
I. 答案：1. solid, liquid, gas 2. ice, melts 3. ice cream
【语法练习】
I.
答案：1. freezes, melts 2. put 3. add
（二）语言能力
理解
【听力练习】
I.
听力文字与答案：
The water is boiling. Look at the steam. (A)
Ice is a solid. (B)
We need to mix the sugar and cream. (C)
II.
听力文字与答案：
1. Water freezes when it’s cold. (A)
2. Let’s make some soup. (C)
3. Shall we put some salt in the soup （B）
III.
听力文字与答案：
1. The water is boiling. What is it changing into ( C )
2. I’m thirsty. Let’s make some juice. ( A )
3. What do we use to make ice cream ( B )
【阅读练习】
I. 答案：
1. True. 2. False. (We can’t see a lot of steam.) 3. False. (We can see a lot of steam.)
表达
【口语练习】
I. 参考答案：
Everything in our world is a solid, a liquid or a gas.
Things can be mixed together to make something new.
Ice cream is a mixture of sugar, cream, salt, ice and chocolate.
Things can change from one state to another when we make them hot or cold.
When we boil the water, it changes into steam/a gas.
When we put the water in the freezer, it freezes/changes into ice.
When it’s hot, the ice melts/changes into water.
【写话练习】
I.参考答案：
My favourite mixture is soup.
I put chicken, onions, carrots and potatoes together.
I put some water and salt in the pot.
I cook the mixture.
It looks nice and tastes good.

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