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Earth is believed by an object the size of Mars at some point in the distant pas
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Earth is believed by an object the size of Mars at some point in the distant pas
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阅读理解. Suppose we built a robot to explore the planet, Mars.We provide the robot
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阅读理解. Scientists have found what look like caves on Mars , and say they could be
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A Chinese satellite is expected to orbit Mars in 2009, an agreement the country
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In January, 2004, the United States successfully launched “Spirit , a Mars Explo
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Scientists have found what look like caves on Mars, and say they could be protec
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The conventional view that the Mars' atmosphere is very poor because the planet
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Scientists have found what look like caves on Mars, and say they could be protec
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Scientists have found no of life on Mars so far,though great efforts have made o
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In January, 2004, the United States successfully launched “Spirit , a Mars Explo
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Suppose we built a robot to explore the planet Mars. We provide the robot with s
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In January, 2004, the United States successfully launched “Spirit , a Mars Explo
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On January 3,2004,the first panoramic image of Mars by NASA’s Mars Exploration R
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In January , 2004, the United States successfully launched “Spirit , a Mars Expl
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Our monitor talks about Mars as if he a scientist. A. is B. were C. be D. had be
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It is reported that China’s first Mars probe Yinghuo-1 will be launched with the
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Although there is no life on Mars now , some scientists think that there some fo
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An interesting suggestion for measuring the atmosphere around Mars has been , th
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In January , 2004, the United States successfully launched “Spirit , a Mars Expl
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Sometime early in the next century, human beings will move to Mars. They will li
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. China will send its first Mars Rover, Yinghuo-1, into space by Russian space r
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Last week, we explained that the planet Mars had passed “opposition. It passed a
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Scientists have found what look like caves on Mars, and say they could be protec
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Suppose we built a robot to explore the planet Mars. We provide the robot with s