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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>>movies, swimming, horse riding. When I was 13, my family moved to another city. Mary and I often wrote
to each other,and sometimes we saw each other-like my wedding and Mary's. Soon we were busy with
children and moving to new homes, and we wrote less often. One day a card that I sent to Mary came back
with the words "Address Unknown". I had no idea how to find Mary.
Over the years,I thought of Mary often. I wanted to share stories of my children and then grandchildren.
And I needed to share my sorrow when my brother and then mother died.There was an empty place in my
heart that only a friend like Mary could fill.
One day I was reading the newspaper when I noticed a photo of a young woman. She looked like Mary
and her last name was White-Mary's married name."There must be thousands of Whites, "I thought, but I
wrote to her anyway. She called as soon as she got my letter."Mrs. Green!" she said excitedly."Mary Allen
White is my mother. "Minutes later I heard a voice that I recognized at once, even after 40 years. We laughed
and cried. The empty place in my heart is filled and there's one thing that Mary and I know. We won't lose
each other again!
B. friend
C. sister
D. teacher
B. had never written to
C. often e-mailed
D. sometimes visited
B. something happy
C. something exciting
D. something interesting
B. She saw a photo of Mary's daughter.
C. She got a call from Mary.
D. She got a call from Mary's daughter.
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