The sun and ____________ planets

are called_______________.

eight / its

the solar system

The earth goes around the sun, and _______

other planets _____________ the sun, too.

seven

go around

There has been life on the earth for

_______________________ ( 数亿 )years. hundreds of millions of

But we have not ________( 找到 ) life on

___________( 其他任何 ) planets yet.

found

any other

But our solar system is only a small part of _______________________( 银河系 ). the Galaxy / the Milky Way

Our solar system is only

_________________ ( 一小部分 )the Galaxy. a small part of

galaxies

Scientists have discovered many other

_________ in the universe.But they are very ____________ so their light

has to travel for many years to ______( 到达 ) us.

far away

reach

It’s _________ to __________ how big the universe is !

(We don’t know how big the universe it.)

impossible imagine

___________( 为了 ) get more information _____ ( 关于 )

the space, scientists have sent spaceships to Mars

_______________( 拍照 ).

In order to on

to take photos (to do sth 表示目的 )

However ， no spaceship has travelled

____________( 足够远 ) to reach other stars in our Galaxy.

far enough

1. 成百万年 2. 在其它的行星上 3. 绕太阳转 4. 他们中没有一个 5. 一小部分 6. 在宇宙中 7. 距离好远 8. 足够远 9. 如此多 10. 和某人联系

millions of years on any other planetsgo around the sunnone of thema small part ofin the universefar awayfar enoughso manycommunicate with sb.

Scientists think that there has been life on the earth for

hundreds of millions of years. However, we have not

found life on any other planets yet.

在地球上

成百上千 数百万 亿万

Let’s know the passage better.

The earth is a planet and it goes around the sun. Seven

other planets also go around the sun. None of them has an

environment like that of the earth, so scientists do not think they will find life on them. The sun and its planets are called

the solar system, and our solar system is a small part of a

much larger group of stars and planets, called the galaxy or

the Milky Way. There are billions of stars in the Galaxy,

and our sun is only one of them.

绕着转

它们中没有一个

be called 被叫做

太阳系 一小部分

一个大的多的星群

银河 几百亿

… 之一

none of … 表示（三个以上）一个也没有。做主语时，谓语动词可用单数或复数

Scientists have also discovered many other galaxies in the universe.

They are very far away and their light has to travel for many

years to reach us. So how harge is the universe? It is impossible to

imagine.

在宇宙里

不得不

这简直无法想象It is +adj for sb. to do sth.

reach =arrive at/ in+ 地点 =get to

Scientists have sent spaceships to the planet Mars to take photos.

They have even sent spaceships to travel outside the solar system.

However, no spaceship has travelled far enough to reach other stars in our Galaxy.

send sth to sp. 发送…到 拍照片

太阳系

adj./ adv enough to do sth 足够做某事

Scientists have always asked the questions: with so many

stars in the universe, are we alone, or is there life out there in space? Have there been visitors to the earth from

other planets? Why has no one communicated with us?

We do not know the answers…yet.

with + 名词 + 介词短语，表示伴随情况，意思是“有……”。

在太空中

其他行星 没人

no one 表示“没有人”，作主语时，谓语动词常用单数形式。

communicate with sb. 与…联系 / 交流

Listen and read the passage.

注意： none 与 no one （ nobody ） 的区别：(1)none 既可指人也可指物，通常与表范围的 of 短语连用；

no one(=nobody) 只能指人，不能与 of 短语连用。如： _________ of the reasons was true. A. None B. No one C. All

(2) none 与数量有关，可回答 how many 问句，表示“一个也没有”；而 no one 表示“什么人也没有”，可回答who 问句。如： -Who are you speaking to?-_________.

-How many students are there in the room?-_________.

A

No one

None

that 是指示代词。为避免重复，可用 that 或 those 来代替前面已提到过的人或事物；

1. The air in the countryside is fresher than ___

______in the city.

2. The streets in the city are wider and the build

ings are taller than ________ in the county.

3. The environment is much cleaner than _____

___ in the city.

that

those

that

2. However, no spaceship has traveled far enough to reach other stars in our Galaxy. 然而，没有一个航天器去到足以到达我们银河系其他恒星那么远的地方。 …enough… to do adj./ adv. + enough + to do sth. 足够…，可以… not + adj./ adv. + enough + to do sth. 不够…，不可以… (1) 我们有足够的钱花。 We have ___________________________. (2) 他跑得够快，很快追上了我们。 He ran __________________ catch up with us soon. (3) 他年龄不够大，照顾不了自己。 He _______________________________________.

enough money to spend

fast enough to

isn’t old enough to look after himself

Look at the picture from a science story for children and answer the questions.

1. What can you see in the picture?

aliens a dog

soft chair

umbrella the earth

the sea

strange machine

2. Can we see the earth from Mars?

3. What color is the earth?

We can see the earth from Mars.

It looks blue.

4. Are the aliens the same as us?

No. They are different from us.5. What color are they?They are green all over.

6. What are the aliens doing on Mars?

Some are … and some are…

7. Are they living a happy life there?

Yes, they are very happy there.

What have the scientists just received?(a message from one of our spaceships)They have just received a message from one of our spaceships.1. Where has the spaceship landed? (Mars)

It has landed on Mars.

2. What has the spaceship discovered? (people on Mars)

3. Why have the people on Mars not sent us a message?

(do not know how to)

It has discovered people on Mars.

They do not know how to send us a message.

They do not know how to visit us on the earth.

4. Why have the people on Mars not visited us on the earth? (do not know how to)

We have just received a message from our spaceship to Mars. Our spaceship has discovered aliens there. They have never sent us a message because they don’t know how to communicate with us. They have not visited the earth because they don’t know how to fly to our planet, and they prefer life on Mars. They seem very happy on their planet. They have used parts from the other spaceships from the earth to make TVs, radios, etc. We hope they don’t do the same with this one.

Homework1. Revise the language points of unit 2.2. Recite the text.3. Do exercises of M3U2

in your WB.