冀教版英语九年级上册Unit 5　Lesson 25　Let's Do an Experiment!同步课时练习 （含答案）

Unit 5　Look into Science
Lesson 25　Let's Do an Experiment!
Ⅰ.根据课文内容,完成短文
It's always interesting to do science experiments. Danny, Jenny and Brain are doing a physics experiment about air 1.　　 　　. Brian describes the experiment to his friends and let them 2.　　 　　 what will happen. Danny thinks the floor will get wet while Jenny thinks the cardboard will 3.　 　 　　 the water. To find out which 4.　　　 　 is correct, they decide to do an experiment. Brian says this is called the scientific 5.　 　　　.
To make the experiment more interesting, they decide to do it 6.　　 　　 Danny's head. Danny is afraid to get wet, so he puts on his 7.　　 　　 before the experiment. Of course the water doesn't pour out at all. Danny is surprised and asks 8.　　 　 　 that is possible. Brian tells him that the 9.　　 　　 of the air is strong enough to keep the water in the jar. Danny concludes that the air is stronger than he 10.　　　 　.
Ⅱ.根据句意及所给提示,写出单词的正确形式
11.Do you often do 　　　 　(experiment) in your science class
12.To keep healthy, we should exercise in a 　　　 　(science) way.
13.Just now we 　　 　　(conclude) that we would finish the work in five groups.
14.Who can tell me the 　　 　 　(正确的) answer to the question
15.The old man was excited and held his hand 　　 　　(紧紧地).
Ⅲ.用方框中所给单词或短语的适当形式填空
be covered with, strong enough, pour out, pressure, be ready
16.She's not 　　　　　　to go walking up mountains.
17.Everybody 　　　　　　for today's test.
18.High blood 　　　　　　kills many people.
19.We should take action to stop the factories 　　　　　　waste water.
20.After years of hard work, the mountains 　　　　　　green trees in summer.
　　　　　　　　 　　　　 　　　　
Ⅳ.单项选择
(　　)21.　　　　 the cup upside down, and you can find where it was made.
A.Take B.Turn C.Bring D.Pour
(　　)22.He is sure 　　　　his theory. Nobody can change his mind.
A.of B.at C.with D.for
(　　)23.[2019·德阳] —Is French easy to learn
—No. I think it's 　　　　than English.
A.more difficult B.most difficult
C.difficult D.much difficult
(　　)24.I won't force anybody 　　　　anything.
A.do B.does C.to do D.doing
(　　)25.You can work out the maths exercise in two different 　　　　.
A.plans B.methods C.answers D.questions
(　　)26.—A terrible smell, Ted!
—Sorry, Mum. I'll 　　　　my socks and put them in the washer.
A.put off B.shut off C.get off D.take off
Ⅴ.句型转换,每空一词
27.The box is filled with clothes. (改为同义句)
The box 　　 　　 　 　　 　　　　　clothes.
28.I'm very sure of my theory. We can even do the experiment over your head. (合并为一句)
I'm 　　 　　sure of my theory 　　 　　we can even do the experiment over your head.
29.We should cover the table with paper first. (对画线部分提问)
　　　 　 　 　　　we do first
30.Take off your coat, please. (改为否定句)
　 　　　 　　 　 　　　　　your coat, please.
31.I am 1.67 metres tall. She is 1.69 metres tall. (合并为一句)
She is a little 　　 　 　 　　 　　me.
Ⅵ.词语运用
　　阅读下面短文,在空白处填入一个适当的单词或括号内单词的正确形式。
Today I did 32.　 　　　 experiment. It was interesting. First, I
　　 　(fill) a jar with water. I covered the top 34.　　 　　 a piece of cardboard and 35.　 　 　　 (hold) it there. Then I 36.　　 　　(turn) the jar upside down and took my hand 37.　 　　 the cardboard. To my
38.　　 　　 (surprised), the water stayed in the jar. Why 39.　 　　　 the force of the air is strong enough to keep the water inside the jar. Through experiments, we can test 40.　　 　　(theory). We call them 41.　　 　　(science) methods. From this experiment, I became more interested in science than before.
Ⅶ.[2020·南通改编] 阅读理解
Do you like physics or chemistry Matter(物质) is always changing, either physically or chemically. If a material goes through a physical change, it is still the same material. During a chemical change, one kind of matter changes into another completely different kind of matter. For example, when we burn wood or cook fish, materials change. People use chemistry every day in the kitchen. The food we eat has many different natural chemicals. Many of the chemicals in food are necessary parts of a healthy diet.
Much of the food we eat has been changed in some way from its original form. The changes that food undergoes may be chemical or physical. If a change does not affect the food's chemical composition, we call it a physical change. For example, melted(溶解的) cheese has gone through a physical change. It gets softer when it is heated but it is still the same type of material. Any change that changes the chemicals in the food is a chemical change. Bread contains carbohydrates, which are chemicals made up of carbon, hydrogen and oxygen. When bread is baked(烘焙), the carbohydrates break down into black carbon and water. The carbon gives the bread a dark colour and a crunchy texture(质地). The water goes into the air.
(　　)42.The material doesn't change when we 　　　　.
A.melt ice cream B.burn paper
C.bake apple pies D.cook beef
(　　)43.After reading the passage, we know that 　　　　.
A.matter is always changing in two ways
B.during a physical change, one kind of matter changes into another
C.chemicals in different kinds of foods that people eat are bad for their health
D.water and carbon can give the bread a dark colour and a crunchy texture
(　　)44.The passage mainly helps us to 　　　　.
A.learn the food's chemical composition
B.learn how to bake bread
C.have a healthy diet with natural chemicals
D.understand physical and chemical changes
答案
Lesson 25　Let's Do an Experiment!
Ⅰ.1.pressure　2.guess　3.hold　4.theory 5.method　6.over　7.raincoat
8.how　9.force　10.thought
Ⅱ.11.experiments　12.scientific　13.concluded　14.correct/right　15.tightly
Ⅲ.16.strong enough　17. is ready 18.pressure　19.pouring out　
20.are covered with
Ⅳ.21.B　22.A　23.A 　24.C　25.B　
26.D　put off意为“推迟”;shut off意为“关闭”;get off意为“下车”;take off意为“脱掉;起飞”。根据“A terrible smell”可知是“脱掉袜子”,故选D。
Ⅴ.27.is full of　28.so; that　29.What should　30.Don't take off　31.taller than
Ⅵ.32. an　33.filled　34.with 35.held　36.turned　37. off 38.surprise　39.Because
40.theories　41.scientific
Ⅶ.【主旨大意】 本文是一篇说明文, 阐述了物质的两种变化,即化学变化和物理变化。
42.A　细节理解题。根据第一段中的“If a material goes through a physical change, it is still the same material.”可知,冰淇淋在融化过程中没有新物质生成,属于物理变化。故选A。
43.A
44.D　主旨大意题。文章列举了一些日常生活中的例子来帮助读者更好地理解物理变化和化学变化,故选D。