1 . Scientists think that there _______ life on the earth for hundreds of millions of years. However, we have not found life on any other planets _______.

The earth is a planet and it _______ around the sun. Seven other planets also go around the sun. _______ of them has an environment like that of the earth, so scientists do not think they will find life on them. The sun and the objects that orbit it are called the solar system, and our solar system is a small part of a much larger group of stars and planets, _______ the Galaxy or the Milky Way. There are billions of stars in the Galaxy, and our sun is only one of them.

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 _______ is the universe? It is impossible to imagine.

Scientists have sent spaceships to the planet Mars _______. They have even sent spaceships to travel outside the solar system. However, no spaceship has travelled _______ to reach other stars in our Galaxy.

Scientists have always asked the questions: with so many stars in the universe, are we _______, or is there life out there in space? Have there been visitors to the earth from other planets? Why has _______ communicated with us? We do not know the answers yet.

1.

A．have been

B．has been

C．is

D．are

2.

A．yet

B．already

C．just

D．ever

3.

A．go

B．went

C．goes

D．going

4.

A．No one

B．Neither

C．Either

D．None

5.

A．called

B．call

C．to call

D．calls

6.

A．what large

B．how small

C．how large

D．how long

7.

A．to take photos

B．take photos

C．taking photos

D．takes photos

8.

A．enough far

B．enough near

C．far enough

D．near enough

9.

A．lonely

B．alone

C．along

D．long

10.

A．someone

B．anyone

C．somebody

D．no one

2 . Humans might live on another planet one day! That seemed ________ years ago. But now the idea might come true. Stephen Hawking, a great British scientist, said that we humans only have 1,000 years to live on the earth. It means that humans will ________ to another planet in 1,000 years.

In fact, we have found one red planet—Mars. Mars is the fourth planet from the sun and it’s ________ to Earth, but it’s much colder than Earth. For many years, scientists have studied Mars.

Some years ago, they ________ robots there and wanted to find water and life on Mars. ________, they found that there is water on it. Then the idea of living on Mars looks possible.

In 2013, Dutch scientists first planned to put ________ on Mars in the 2030s. They offered (提供) people one-way tickets to go and build new homes on Mars. ________ it was dangerous, over 200, 000 people still wanted to take part in (参加).

American scientists showed another plan to get humans to Mars in 2033. They are working on building larger ________ to fly to Mars these days. They are also doing a lot of preparations to help people ________ the earth.

I believe that humans will go to Mars and have an even closer look ________ our red neighbor.

1.

A．beautiful

B．wonderful

C．impossible

D．terrible

2.

A．walk

B．climb

C．dream

D．fly

3.

A．close

B．far

C．hot

D．big

4.

A．bought

B．sent

C．made

D．saw

5.

A．However

B．Unluckily

C．Luckily

D．So

6.

A．humans

B．monkeys

C．robots

D．water

7.

A．Because

B．Although

C．But

D．When

8.

A．factories

B．cars

C．houses

D．rockets

9.

A．fly up to

B．take care of

C．look for

D．get back to

10.

A．at

B．into

C．after

D．for

3 . It often takes astronauts days to go to the moon. But will people live there? Will people build _______ city on the moon?

Some people think it is ________. But it won’t be easy. There isn’t ________ oxygen (氧气) on the moon. Spaceships (宇宙飞船) will need to bring oxygen from the earth. Food will be a problem, too. How will people grow vegetables? There isn’t any water, ________ scientists think that they might find some ice. The energy (能量) for the city won’t be a problem—it will come ________ the sun.

________ will go to the moon? Maybe scientists will go there. The moon is an interesting place for ________. It is never cloudy or rainy on the moon, so it is a good place ________ the stars and planets. Maybe we will build a university for them. We will probably build a hotel for ________, too. There are no beaches on the moon, but people can walk on the moon and take photos of the earth.

Will it ________ ? Maybe. But one thing is true: A visit to the moon hotel will be very expensive!

1.

A．a

B．an

C．the

D．/

2.

A．difficult

B．difficultly

C．easy

D．easily

3.

A．any

B．some

C．none

D．other

4.

A．or

B．if

C．because

D．but

5.

A．to

B．from

C．into

D．about

6.

A．When

B．Who

C．Why

D．How

7.

A．them

B．us

C．you

D．it

8.

A．study

B．to study

C．studies

D．studying

9.

A．student

B．students

C．visitor

D．visitors

10.

A．catch

B．to catch

C．happen

D．to happen

5 . 阅读下面短文，理解大意，然后从各小题的四个选项中选出一个最佳答案，使短文连贯完整。

The universe (宇宙) is everything out in space. Nobody ______ how large the universe is. When we talk about the universe, we mean the Earth, the Sun, the Moon and all the ______ , and the space between them.

Now let me tell you something about the ______ . It is like a large ball. It ______ around the Sun. And ______ and land cover it. If you are in a spaceship and ______ the Earth from space, you will find that there are some blue parts. They are the seas.

We live on the outside part of the Earth. Around us is the air. It takes the Earth 24 ______ to turn in a full circle (整圈). When you see the Sun shining ______ , it’s the day for you. But when the Earth turns you away from the Sun, everything around you ______ dark(黑暗的).

Can you tell me something else about the universe? I think it is ______ and I want to learn more about it.

1.

A．leaves

B．knows

C．blows

D．pollutes

2.

A．gardens

B．planes

C．stars

D．rockets

3.

A．Maths

B．Sun

C．Earth

D．Land

4.

A．goes

B．waits

C．shows

D．keeps

5.

A．water

B．ice

C．snow

D．cloud

6.

A．watch

B．hear

C．feel

D．touch

7.

A．nights

B．minutes

C．days

D．hours

8.

A．easily

B．brightly

C．badly

D．slowly

9.

A．flies

B．kicks

C．ties

D．becomes

10.

A．weak

B．nervous

C．interesting

D．tiring

6 . The universe (宇宙) is everything out in space. Nobody _______ how large the universe is. When we talk about the universe, we _______ the Earth, the Sun, the Moon and all the stars, and the space between them.

Now let me tell you something about the _______. It is like a large ball. It _______ around the Sun. And _______ and land cover it. If you are in a spaceship and _______ the Earth from space, you will find that there are some large blue parts. They are the seas and about 70% of the Earth’s surface (表面) is water.

We live on the outside part of the Earth. Around us is the air. It takes the Earth 24 hours to turn in a full _______. When you see the Sun shining _______, it’s the day for you. But when the Earth turns you away from the Sun, everything around you becomes _______.

Can you tell me something else about the universe? I’m ________ in it and want to learn more about it.

1.

A．studies

B．knows

C．asks

D．forgets

2.

A．protect

B．leave

C．mean

D．see

3.

A．universe

B．Sun

C． Earth

D．Moon

4.

A．goes

B．waits

C．shows

D．keeps

5.

A．water

B．ice

C．snow

D．cloud

6.

A．watch

B．hear

C．feel

D．touch

7.

A．world

B．circle

C．part

D．way

8.

A．easily

B．brightly

C．quickly

D．slowly

9.

A．cleaner

B．brighter

C．warmer

D．darker

10.

A．honest

B．lucky

C．interested

D．tired

9 . Maybe you know a lot about the city you live in. You may even know some interesting facts about earth, but ________ do you know about Mars? Will there be ________ there just like people on Mars?

Mars is the fourth planet from the sun and it’s the most like earth, but it’s much ________ than earth because it’s farther from the sun. It’s also the only planet whose surface can be ________ from earth.

Mars is often called “the red planet” because the rocks on it have a dark ________ color. There are strong winds on Mars that can ________ dust into the hills. For many years, people have ________ Mars. They have sent instruments and robots there. Some of the robots got there, ________ most failed. NASA(美国国家宇航局) sent two robots to Mars two years ago. They wanted to ________ signs of water and life on Mars. Some day, humans will travel to Mars and have an even ________ look at our red neighbor. Maybe it could be you!

1.

A．when

B．what

C．how

2.

A．sound

B．life

C．air

3.

A．hotter

B．colder

C．smaller

4.

A．seen

B．wrote

C．visited

5.

A．red

B．black

C．yellow

6.

A．blow

B．look

C．mix

7.

A．lived on

B．landed on

C．studied

8.

A．but

B．and

C．however

9.

A．leave

B．use

C．find

10.

A．faster

B．farther

C．closer

10 . Scientists have long been looking for life in outer space. They recently found something exciting _______ Venus(金星), the planet closest to ours.

British scientists _______ phosphine gas(磷化氢) in Venus’ atmosphere(大气层) already. Phosphine is a promising sign of life. On Earth, phosphine is produced when organic(有机的) matter breaks down. The same thing could be _______ on Venus. Still _______ need to send a probe( 探测器) to Venus to see _______ life exists there.

In fact, Venus has long been ignored(忽视) in the search for life because of its ______temperatures and atmospheric pressure. Venus is the _______ planet in the solar system. Its surface temperature is 470℃, which is hot enough to melt spacecraft. The pressure there is 92 times greater than that on Earth. Even if humans could bear the heat, they would be crushed(粉碎) by the pressure.

However, it’s possible that life could exist in the planet’s atmosphere. Temperatures there are about -1℃ to 93℃，which is far more suitable _______ life. The pressure there is similar to that of Earth as well. The phosphine was found in Venus’ cloudy atmosphere-around 60 _______ above its surface.

Phosphine is known as an indirect sign of life. So are gases like methane and ozone(臭氧). Scientists focus on such signs when they look for ________ outside of Earth. These gases can exist in the atmospheres of planets for a long time allowing scientists to find them with the help of telescopes and probes. However, it is liquid water that is considered to be the most important sign of life.

1.

A．in

B．of

C．on

D．below

2.

A．have discovered

B．discovered

C．discover

D．discovers

3.

A．happen

B．happening

C．happened

D．happens

4.

A．science

B．scientific

C．scientist

D．scientists

5.

A．whether

B．what

C．how

D．why

6.

A．low

B．high

C．hot

D．cold

7.

A．hot

B．hotter

C．hotest

D．hottest

8.

A．for

B．in

C．at

D．on

9.

A．kilometer

B．meter

C．meters

D．kilometers

10.

A．food

B．life

C．animals

D．stones