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5. Look!There are lots of weeds (漂浮) on the water.

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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.

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