1 . 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

2 . If you are dreaming of becoming an astronaut after you grow up, get started now! An astronaut needs a strong body and mind. Shenzhou XIII astronauts are able to live upside-down （倒立）. They do this not just during sleep, but also when eating and going to the toilet. Before they ________ space, they had lots of practice. Each upside-down training time lasted for 20 days.

Chinese astronauts aren’t just spaceship ________ but also machine repairers（修理工）and scientists. They have to know every part of the spaceship and how it ________. If something goes wrong, they’ve got to know ________ repair it. Also they do scientific experiments in space.

Shenzhou XIII astronauts know how to live in ________. They took a knife, a gun（枪）and some dye（染色水）________ them into space. If they land in forests, the knife and gun can protect them from wild animals. If they ________ the sea, the dye can colour the seawater around them yellow. This can drive ________ sea animals away.

Shenzhou XIII astronauts can’t get dizzy（眩晕）. A spaceship is not a plane. When it ________ the extra gravity force（额外重力）can break people’s bones（骨头）.

Astronauts must have strong bodies for this. They can’t get a headache or be sick. Because they have to ________ many things. They’ve got no time for sickness. Do you still have a long, long way to go?

1.

A．went through

B．lived in

C．stayed at

2.

A．teachers

B．students

C．drivers

3.

A．works

B．flies

C．lives

4.

A．what to

B．why to

C．how to

5.

A．the world

B．the water

C．space

6.

A．by

B．with

C．for

7.

A．fall into

B．jump into

C．fly over

8.

A．unnecessary

B．lively

C．dangerous

9.

A．sits down

B．goes up

C．runs away

10.

A．look after

B．look for

C．look through

4 . Our earth gets _________ warmth and light from the sun. The sun is a huge blazing(酷热的)ball, a _________ times larger than the earth. And it is _________ of miles away. The earth spins(旋转)round once every 24 hours. It turns to _________ the sun and spins away every 24 hours.

When our part of earth looks on to the sun, we see sunlight and we have _________. When our part turns away from the light, we have _________.

When our part begins to turn towards the sun and we see the first sunlight, we call it _________. When we are facing the sun most directly, it is _________. Then the sun is _________ to begin straight (直接地)above us. When we begin to turn away from the sun, we have afternoon, evening and __________.

1.

A．it

B．its

C．it’s

2.

A．hundreds

B．thousand

C．million

3.

A．hundreds

B．thousands

C．millions

4.

A．head

B．nose

C．face

5.

A．minute

B．day

C．date

6.

A．night

B．time

C．day

7.

A．noon

B．morning

C．evening

8.

A．afternoon

B．evening

C．noon

9.

A．close

B．closer

C．closest

10.

A．afternoon

B．morning

C．night

5 . Do you have a dream of going to the Moon? In July 1969, two astronauts from the US walked on the Moon. Their names were Neil Armstrong and Buzz Aldrin. If you visit the Moon today, you will still be able to _______ their footprints! They also left behind the _______ flag.

When the astronauts went to the Moon, they needed to _______ spacesuits and helmets (头盔) to protect themselves, because sometimes the Moon is very _______ or very hot. The helmets also helped them breathe because there is no _______ on the Moon.

Do you know that if you weigh 70 pounds on Earth, you will weigh only 11.5 pounds on the Moon? And if you go for a _______ on the Moon, you will jump with each step. Here is a (n) _______ thing about the Moon: Do you know that the Moon is like a mirror? It reflects (反射) the _______ of the Sun and _______ it to the Earth. And that makes the Moon look __________ and beautiful! Don’t you agree we have a beautiful Moon?

1.

A．build

B．buy

C．see

2.

A．American

B．English

C．Japanese

3.

A．blow

B．provide

C．wear

4.

A．quiet

B．cold

C．different

5.

A．water

B．air

C．wind

6.

A．space

B．walk

C．look

7.

A．foreign

B．modern

C．interesting

8.

A．light

B．sound

C．smell

9.

A．sends

B．carries

C．brings

10.

A．young

B．dark

C．bright

6 . Long long ago, people _______ know much about the sun or the earth. They thought that the sun went round the earth. In _______ places, people even said the sun was a god. They thought that the god _______ across the sky every day on a golden horse.

Now _______ the help of scientists, we know that the earth _______ round the sun. It takes the earth a year to go all the way round the _______. Today men know how far it is _______ the earth to the sun. The sun is a star. It _______ much bigger than the earth. It looks smaller only _______ it is too far away. It is too hot for us to reach. Scientists ________ told us that the earth travels a thousand miles on its way round the sun.

1.

A．doesn't

B．didn’t

C．don’t

2.

A．any

B．an

C．some

3.

A．drive

B．drives

C．drove

4.

A．from

B．with

C．under

5.

A．goes

B．go

C．went

6.

A．earth

B．sun

C．moon

7.

A．in

B．from

C．into

8.

A．was

B．is

C．be

9.

A．so

B．and

C．because

10.

A．also

B．too

C．either

8 . Believe it or not, the day when you can go to the moon is coming soon. You can go into space _______ space shuttle (太空船). It _______ about three days for the shuttle to go from the earth to the moon. The shuttle flies a long way to a space station. You can stay there for a short rest and then it will _______ you to the moon.

Now you can jump out of the shuttle. But you mustn’t take off your spacesuit (太空服), because it is very hot in the daytime and very cold at night on the _______. The moon is much smaller than the earth. Things are _______ on the moon than they are on the earth. You can jump high every time you take a step. You will find that it is never tiring to walk on the moon. You don’t need to take an umbrella or a raincoat with you _______ there is no rain on the moon. You can hear _______ because there is no air on the moon. And there are no animals or other living things there.       

The moon moves more _______ than the earth, so one day on the moon is as long as two weeks on the earth and one night is just as long as two weeks on the earth. What could you do in _______ long days and nights and in a silent world? Now ________ are trying to make the best of the moon. But our earth is really a far better place to live, as long as we take good care of it.

1.

A．by

B．under

C．for

D．with

2.

A．spends

B．costs

C．takes

D．pays

3.

A．join

B．carry

C．count

D．communicate

4.

A．station

B．shuttle

C．earth

D．moon

5.

A．light

B．heavy

C．lighter

D．heavier

6.

A．because

B．when

C．if

D．so

7.

A．something

B．anything

C．everything

D．nothing

8.

A．slow

B．fast

C．slowly

D．quickly

9.

A．so

B．such

C．very

D．too

10.

A．teachers

B．scientists

C．things

D．space shuttles

9 . We have always been interested in the moon. Two thousand years ago, people already knew that the moon _________ around the earth and where it would be in the sky at different times of the year. At that time, everything about the moon was learned by _________ it carefully in the sky.

When scientists could use telescopes to study the moon more closely, their ideas began to _______. They could see that the moon was made of rocks. Most scientists thought moon rocks would be different from those on the earth. This was _________ they believed the moon had once been a planet that had been caught in the earth’s gravity (引力) millions of years earlier.

In 1969, moon rocks were finally _________ to the earth and studied. To their surprise, scientists found that, except water, the moon and the earth were made of the same things. Once again new ideas were needed for this new information.

After years of study, most scientists now think that the moon was once part of the earth. They believe very early in its history, maybe 4 billion years ago, something about the size of Mars hit the earth. This _________ billions of rocks into space around our planet. These rocks _________ joined together and after many years became the moon.

1.

A．moved

B．moves

C．move

D．moving

2.

A．looking

B．seeing

C．watching

D．searching

3.

A．improve

B．change

C．agree

D．express

4.

A．because

B．why

C．whether

D．how

5.

A．taken

B．caught

C．brought

D．put

6.

A．sent

B．hit

C．influenced

D．produced

7.

A．quickly

B．easily

C．slowly

D．exactly