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4. This problem can (solve) if we work hard together.

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() 1.  (2015 •廣東) 一there any living things on other planets?

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4. Walk a short (距離) and there you are.

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The journey to the Moon is the first step towards space exploration. The distance between the Moon and the Earth is very short indeed when compared with the distances between the Earth and other planets. Mars,the nearest planet to the Earth,is millions of miles away!Travelling to the planet will be man's next aim. Such travels will be more challenging than the trip to the Moon and certainly more adventurous.

Two American spaceships,Vikings 1 and 2,landed on Mars trying to discover whether that planet has any life on it. So far the sign of life on Mars has neither been confirmed (確認) nor been ruled out Russians have discovered that the surface of Venus (金星) is so hot that it is almost certain that there is no life there. Also the atmosphere of Venus is extremely dense (稠的) and the pressure is nearly a hundred times greater than that of the Earth’s atmosphere.

Scientists believe man may find planets which have the same conditions as those we have on the Earth,but man should realize the Earth will be their only home for a long time and begin to love and care for it.

() 1. According to the passage,travelling to Mars will be.

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   B. far more exciting and dangerous

   C. man’s final aim

   D. man’s first step

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   A. Mars is nearer to the Earth than the Moon.

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   B. everything needed is provided by the Earth

   C. the only home for man will be the Earth for a long time

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1. We should try our best to prevent water (pollute) because people can’t live without water.

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