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Maybe you know a lot about the city you live in. You may even know some interesting facts about Earth, but 16 do you know about Mars? Will there be 17 there just like people on Earth?
Mars is the fourth planet from the sun and it's the most like Earth, but it's much 18 than Earth because it's farther from the sun. It's also the only planet whose surface can be 19 from Earth.
Mars is often called "the red planet" because the rocks on it have a dark 20 color. There are strong winds on Mars that can 21 dust into the hills.
For many years, people have 22 Mars. They have sent instruments and robots there. Some of the robots got there, 23 most failed.
NASA(美国国家宇航局) sent two robots to Mars two years ago. They wanted to 24 signs of water and life on Mars. Some day, humans will travel to Mars and have an
even 25 look at our red neighbor. Maybe it could be you!
( )16. A. when 
B. what C. which D. how
( )17. A. sound B. life C. air D. water
( )18. A. hotter B. colder C. bigger D. smaller
( )19. A. seen B. wrote C. heard D. visited
( )20. A. red B. black C. white D. yellow
( )21. A. blow B. look C. mix D. fly
( )22. A. lived on B. landed on C. studied D. written
( )23. A. but B. and C. however D. or
( )24. A. leave B. use C. find D. give
( )25. A. faster B. farther C. closer D. lower
查看习题详情和答案>>they're not real stars. They are man-made satellites. And the biggest of all is the International Space Station
(ISS 国际空间站).
From now until July is the best season to watch the ISS flying over the earth, and people can see it just
with their eyes. The ISS is the biggest man-made satellite because scientists want to live on it. They think
that the best way to learn more about space is to live there.
When the space station is finished, it will be like a city in space. People will stay and study there with
many of the things they have at home. Laboratories, living rooms and power stations are being built. The
ISS is the most ambitious (雄心勃勃) and expensive space program ever. Billions of dollars are being spent
on it every year.
Scientists hope that the ISS will be a stepping-stone (垫脚石) for future space exploration."The ISS will
help us better understand the human body, explore space and study the earth. It can help us make life on the
earth better," said Kathryn Clark, an ISS scientist.
China is not an ISS country, but it has helped with some of the experiments. China sent some rice up to
the ISS to find out what space would do to it.
The ISS is not finished yet. More than 100 parts need to be put on. Scientists hope it will be finished as
soon as possible. After it's finished, more than 90% of the world's population will be able to see the Space
Station. So keep looking up, and maybe you'll see it get bigger.
B. a man-made satellite
C. an outer space moving star
D. a stepping-stone to the sun
B. while flying on the earth
C. in a special room
D. from now till July
B. a city
C. a living room
D. a museum
B. to build the ISS will cost less in the future
C. China did some research on wheat through the ISS
D. the best way to learn more about space is to live on the ISS
aren't real stars. They're satellites, a machine that has been sent into space and goes around the Earth, moon,
etc. And the biggest of all is the International Space Station (ISS).
The ISS is the biggest satellite because scientists want to live on it. They think that the best way to learn
more about space is to live there. The space shuttle Discovery has taken off from the Kennedy Space Center
in Cape Canaveral, Florida several times and carried a few groups of astronauts to the International Space
Station.
When the space station is finished, it will be like a city in space. People will stay and study there with many
of the things they have at home. Laboratories, living rooms and power stations are being built. The ISS is the
most expensive space program ever. Millions and millions of dollars are being spent on it every year.
Scientists hope that the ISS will be a stepping stone for future space exploration. "The ISS will help us
better understand the human body, explore (know more about) space and study the earth. It can help us make
life on the earth better," said Kathryn Clark, an ISS scientist.
Sixteen countries are in the program: The US, Russia, Canada, Japan, Brazil and 11 European countries.
China is not an ISS country, but it has helped with some of the experiments. In 2003, China sent some rice
up to the ISS to find out what space would do to it.
Twenty Chinese students talked directly to an astronaut (spaceman) in the International Space Station (ISS)
on radio in Nanjing, capital of east China's Jiangsu Province on Sunday, 2007. The 20 students, aged 10 to 19
from Shanghai, Guangzhou and Nanjing, began talking to Clayton C. Anderson, a 48-year-old American
astronaut at 18:50 p.m. at Nanjing No. 3 Middle School when the ISS was passing over Nanjing.
After it's finished, more than 90 percnt of the world's population will be able to see the space station. So
keep looking up, and maybe you'll see it get bigger and brighter.
B. some students from Nanjing have been to the ISS
C. China is one of the members in the ISS group
D. the ISS is still in the space but has stopped working
B. machines that go around the earth, the moon and some stars
C. buildings where electricity is produced to supply a large area
D. some countries which help send the ISS up into space
—Because they _______.
B. could talk with some Chinese school students
C. hoped to travel to Mars and Venus some day
D. wanted to live in space and do better research
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The sun is really a star. It’s much bigger than the earth and it is very hot. Some people have been to the moon, but we know no one can go to the sun. It’s too hot for people to live anywhere near it. The sun is three hundred thousand times heavier than the earth and more than a million times larger.
1.Long ago people thought_____.
A. the sun circled the earth
B.the earth circled the sun
C.the earth went round the sun
D.the moon went round the sun
2.It takes_____.
A. the sun one year to go all the way round the earth
B.the earth one year to go all the way round the sun
C.the earth one month to go round the sun
D.the sun one month to go round the earth
3.In fact the earth travels _____in the space.
A. a million kilometers an hour
B.half a thousand kilometers a minute
C.very fast
D.very slowly
4.People can never live anywhere near the sun because_____.
A. the sun is too hot
B.the sun is too far
C.the sun is too big
D.spaceships can’t reach the sun
5.The earth is_____.
A. as heavy as the sun
B.much heavier than the sun
C.as light as the sun
D.much lighter than the sun
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