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四级练习2012.09.04


       
       




When my interest shifted from space to the sea, I never expected it would cause such confusion among my friends, yet I can understand their feelings. As I have been writing and talking about space flight for the best part of 20 years, (1)___________. To explain, I’d like to share my reasons behind this unusual change of mind. The first excuse I give is an economic one. (2)_____________. The first round-trip ticket to the moon is going to cost at least 10 billion dollars if you include research and development. By the end of this century, the cost will be down to a few million. On the other hand, (3)_______________. My second argument is more philosophical. The ocean, surprisingly enough, has many things in common with space. In their different ways, both sea and space are equally hostile. If we wish to survive in either for any length of time, we need to have mechanical aids. The diving suit helped the design of the space suit. The feeling and the emotions of a man beneath the sea will be (4)____________




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1  a sudden switch of interest to the depth of the sea does seem peculiar  
2  Underwater exploration is so much cheaper than space flight
3  the diving suit and a set of basic tools needed for skin diving can be bought for twenty dollars   
4 much like those of a man beyond the atmosphere
1

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  • Rebecca949

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1. a sudden switch of interest to the depth of the sea does seen peculiar
2. Underwater exploration is so much cheaper than space flight
3. the diving suit and set basic tools needed for skin diving can be bought for 20 dollars
4. much like those of the man byond the atmosphere
1

评分人数

  • Rebecca949

TOP

1. a sudden switch interest to the depth of the sea does seen peculiar
2. Underwater explanation is so much cheaper than space flight
3. the diving suit and set basic tours needed for skin diving can be bought for 20 dollars
4. much like those of a man byond the atmosphere
1

评分人数

TOP

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