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Lesson 26

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What will happen if you put a jar upside down over a burning candle?

Look and think.

Science is so interesting! Let’s do this experiment together. I’m sure you’ll like this experiment!

Unit 5

Look into Science

Lesson 26

Keep the Candle Burning

Check preview

1. shallow(反义词)______________

2.match （复数） _____________

3.half(复数） _____________

4.用XXXXX把XXXXX装满 _______________

5.两到三分钟 _______________

6.用光 _______________

7.五分之一 _______________

8.由XXXXX组成 _______________

9.停止做某事 _______________

deep

matches

fill....with......

two or three minutes

use up

one fifth

be made up of

stop doing sth

halves

a candle

a candle _______

a big glass ___

a _______ dish

some water

a lighter or _______

holder

jar

matches

shallow

What do you need?

Task 1

1. Put the candle in the _____________.

2. Put the candle holder on the dish.

3. Fill the dish half ________water.

4. _____ the candle.

5. Let the candle burn for two or three minutes.

6. Carefully put the jar over the candle _____ the top of the jar rests on the dish.

7. _________ the water in the jar.

What do you do?

candle holder

full with

Examine

until

Light

Task 2

Listening

As the candle burns, it uses ___________ in the air.

When the candle stops burning, it has ____________________ in the jar.

The water inside the jar ____.

Analyze: Why’s the phenomenon?

used up all the oxygen

Because about one fifth of the air _____________ oxygen, the water rises and fills about __________ of the jar.

is made up of

Analyze: How far does the water rise?

the oxygen

rises

one fifth

Task 3

light the candle 点亮蜡烛

use up 用完

be made up of 由XXXXXXXXXX组成

fill sth with sth 用XXXXXXXXXX把XXXXXXXXXX填满

Task 4

Look out the following expressions in the passage.

one fifth五分之一

两三分钟

Language points

1) 分数由分子及分母两部分构成。用英语表达时，分子用基数词，分母用序数词。

2) 若分子为1，则分母的序数词为单数形式，若分子大于1，则分母的序数词用复数形式。

? ＝ one (a) half 或 one second (one-second)

? = one (a)quarter 或 one-quarter

分数的英语表达

二分之一

三分之一

四分之一

四分之三

五分之二

十分之九

口 诀:

分子基，分母序。分子㧐1 ，分母加s 。

a/one half (one second)

one-third

one quarter

three-fourths three quarters

two-fifths

nine-tenths

分数做主语：

1）如果of后面是可数名词单数形式或不可数名词,则谓语动词也用单数形式（三单）；

2）如果of后面是可数名词复数形式,则谓语动词也用复数形式；

例如：Two thirds of the desk___(be) painted red.

Two thirds of the studnents in my class____(be)

boys.

One fifth of the water_____ (come) from the underground.

3).但是当分数词修饰population时,则谓语动词一律用复数形式.

如：Seven tenths of the populaiton in China are farmers

is

are

comes

1

Read the lesson and fill in the blanks.

Let’s do the experiment together! Put the candle in the candle holder. Put the candle holder on the dish. Fill the dish half full with water. Light the candle with a______ or a lighter. What can you see? The candle is burning. _____ the candle burn for two or three minutes. Then carefully put the jar over it until the top of the jar rests on the dish. As the candle burns, it_____ the oxygen in the air. When the candle stops_________, it has used up all the oxygen in the air. The water inside the jar_____ and fills about________ of the jar. This is because about one fifth of the air is made up of oxygen.

match

Let

uses

burning

rises

one fifth

P69

Task 5

2

Circle the correct words to complete the sentences.

1. Don’t (use up/ push up) all of the ink. Leave some for me.

2. The medical team (is made of/

is made up of) five experienced doctors.

3. Please fill the hole (with/ in) sand and water.

4. They didn’t realize their mistake (until/ as) we told them.

5. My brother wasn’t (strong enough/ enough strong) to lift the box.

P69

Task 6

注：另附word文档，点此链接

1. The water here is s______, not deep.

2. Let the fire b______ for a few hours. The room will be very warm.

3. Look! The boy is playing with some ________ (火柴).

4. There is little ______ (氧气) at the top of the mountains.

5. Mr. Black sat down and __________ (点燃) a candle.

I. 根据首字母或汉语提示，完成下列句子。

lighted

hallow

urn

matches

oxygen

1. Please pass me the bottle full _of_ water.

2. He is so hungry that he has eaten ______ all the food on the plate.

3. I usually put the candle ______ the candle holder.

4. Mr. Gao came into the classroom ______ a book in his hand.

5. The rainy day will last ______ three days.

II. 用适当的介词填空。

for

of

up

in

with

1. 当蜡烛停止燃烧时，它已用光了空气中所有的氧气。

When the candle _______ ________, it ____ ______ ______ all the oxygen in the air.

2. 我们班里五分之三是女生。

__________ of the students in our class are girls.

3. 为了完成那项工作，他工作了十个小时。

____ _____ the work, he has worked ____ ten hours.

III. 根据汉语提示，翻译下列句子。

stops burning has

used up

Three fifths

To finish for

Writing

Let’s do the experiment. First, _________ ____________. Second, _______________ ________________________________________________________________...

As the candle burns, it _____ the _____. When the candle stops _____, it has ___ ____ all the oxygen in the air. The water inside the jar ____ and fills about _____ _____ of the jar. This is because about one fifth of the air is _____ ___ ___ oxygen.

Can an egg “swim”in the water?

1. What do we need?

Do an experiment：

First, _________________________.

put some salt into the glass

Then, _______________.

add some water

next, ______________________________.

mix the salt and the water together

Finally, ______________________.

put the egg into the glass

The egg can’t touch

the bottom of the

glass and it swims

in the water.

3. What is happening?

4. Why?

盐水的密度变大，鸡蛋的浮力大于重力。

Homework

1. Preview the words and expressions in Lesson 27.

2.请根据课文内容, 以 “An Interesting

Experiment”为题写一篇小作文 [全文已结束，注意以上仅为全文的文字预览，不包含图片和表格以及排版]

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