六级冲刺练习:阅读(106)-查字典英语网
搜索1
所在位置: 查字典英语网 > 大学英语 > 六级大学英语 > 六级大学英语阅读 > 六级冲刺练习:阅读(106)

六级冲刺练习:阅读(106)

发布时间:2016-03-03  编辑:查字典英语网小编

  Sugar is, then, 14 to our civilization. But what 15 is it? Of course, most of us recognize sugar immediately as the sweet material which we put in coffee or cakes. This common form of sugar is derived from two plants: the sugar cane and the sugar beet . But there are in fact many types of sugar, and the chemist recognizes hundreds of different 16 , each coming from a different source.

  About 90% of the sugar is produced as food. Only 10% is used in industry for 17 other than food production. Yet sugar has great possibilities for use as the basis of chemicals. It can even be used for making plastics. In the future these potential uses will certainly be developed more than in the past.

  There are many reasons why we should 18 the production of sugar. Most important is that it is one of the most highly concentrated of energy foods.

  Thus sugar cane and beet produce an average of 7,000,000 calories per acre. In this way they have the advantage over potatoes which give only 4, 000, 000, while the 19 for wheat and beans is 2 ,000,000 each. So three acres of land growing wheat, beans and potatoes give only 20 more energy than one acre

  of sugar.

  A. slightly B. intention C. reason D. modern

  E. strongly F. figure G. come H. significant

  I. exactly J. increase K. proposals L. turn

  M. purposes N. varieties O. serious

  II. C 12. G 13. D 14. H 15. I 16. N 17. M 18. J 19. F 20. A

  

点击显示

推荐文章
猜你喜欢
附近的人在看
推荐阅读
拓展阅读
  • 大家都在看
  • 小编推荐
  • 猜你喜欢
  •