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of it are a little red or pink. Its name was given by the Romans in honor of their god of war.
People on the earth need oxygen to breathe. There is almost no oxygen on Mars. Living on Mars would be
like living on a very high mountain. There would be little air. It might be 50 degrees above zero at noon and 100
degrees below zero at night. We know that Mars has carbon. Through a telescope, Mars looks red. In some
places, it seems gray. At times the gray turns gray-green, then brown, then gray again. The gray-green may be
a kind of plant color which changes with the seasons.
Life is expected on Mars by scientists, because there are distinct seasons on the planet's surface. This
condition might support plants. However, some researches find if Mars had life, it must have been a long time
ago. For Mars' first 600 millions years, it had plenty of water and proper temperatures for life. But now the
planet's environment has changed. Mars is not a pleasant place for any form of life.
1. 根据解释，在短文中找出相应的单词或短语。
______: famous ______: sometimes
2. Its name was given by the Romans in honor of their god of war.
(改为主动语态的句子) __________________________________________________________________
3. Why is life expected on Mars by scientists?
(回答问题) __________________________________________________________________
4. There is almost no oxygen on Mars.
(改为反意疑问句) There is almost no oxygen on Mars, _____ _____?
5. But now the planet's environment has changed. Mars is not a pleasant place for any form of life.
(翻译成汉语) __________________________________________________________________
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>>| 完形填空。 | |||
| Maybe you know a lot about the city you live in. You may even know some interesting facts about Earth, but 1 do you know about Mars? Will there be 2 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 3 than Earth because it's farther from the sun. It's also the only planet whose surface can be 4 from Earth. Mars is often called "the red planet" because the rocks on it have a dark 5 color. There are strong winds on Mars that can 6 dust into the hills. For many years, people have 7 Mars, They have sent instruments and robots there. Some of the robots got there, 8 most failed. NASA(美国国家宇航局) sent two robots to Mars two years ago. They wanted to 9 signs of water and life on Mars. Some day, humans will travel to Mars and have an even 10 look at our red neighbor. | |||
| ( )1. A. when ( )2. A. sound ( )3. A. hotter ( )4. A. seen ( )5. A. red ( )6. A. blow ( )7. A. lived on ( )8. A. but ( )9. A. leave ( )10. A. faster |
B. what B. life B. colder B. wrote B. black B. look B. landed on B. and B. use B. farther |
C. which C. air C. bigger C. heard C. white C. mix C. studied C. however C. find C. closer |
D. how D. water D. smaller D. visited D. yellow D. fly D. written D. or D. give D. lower |
some countries people even said that the Sun was a god(神). They thought the god drove across the sky each day on a golden horse. Now we know the Earth goes round the Sun. It takes the Earth a year to go all way round the Sun.
Today man even know how far it is for the Earth to go round the Sun. They
tell us that the Earth travels over a thousand miles a minute on its journey
round the Sun.
The Sun is really a star. It is much bigger than the Earth and it is very hot. Some people have been to the moon but we know that no one can ever go to
the Sun. It is far too hot for people to live anywhere near it. The Sun is three hundred thousand times(倍)heavier than the Earth and more than 1 million
times larger.
B. a god on a golden horse
C. a god with golden dress
D. a god and a golden horse
B. too far
C. too small
D. too heavier
B. 100, 000
C. 6, 000, 000
D. 60, 000
B. the time the Earth travels one thousand miles.
C. the time the Earth goes round the Sun one circle(圈,周).
D. the journey of the Earth.
B. One day man can land on the Sun.
C. The Sun is a star like other stars.
D. The moon is the nearest star to us in space.