Sugar is so much a part of our modern life that we only really think about it when.for some reason.we cannot obtain it．It has been known to man for at least 3.000years.but has come into common use on 题目和参考答案——青夏教育精英家教网—

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18．Sugar is so much a part of our modern life that we only really think about it when，for some reason，we cannot obtain it．It has been known to man for at least 3，000years，but has come into common use only in modern times．Until quite recently it was considered as a medicine and as a luxury for the very rich only．
Sugar is，then，very important to our civilization．But what exactly 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 （a type of grass which grows to a height of twenty feet） and the sugar beet （which grows underground）．But there are in fact many types of sugar，and the chemist recognizes hundreds of different varieties，each coming from a different source．
About 90% of the sugar is produced as food．Only 10% is used in industry for purposes 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 increase 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 7，000，000calories per acre．In this way they have the advantage over potatoes which give only 4，000，000，while the figure for wheat and beans is 2，000，000 each．So three acres of land growing wheat，beans and potatoes give only slightly more energy than one acre of sugar．

56．The heading of Paragraph 1may beB．
A．What Sugar Is
B．Sugar Through the Ages
C．The Advantages of Sugar
D．Present and Future Uses of Sugar
57．The third paragraph emphasizesD．
A．about 90% of sugar used as food
B．only 10% of sugar used in industry
C．sugar used for making plastics
D．future uses of sugar
58．The main reason why we should increase the production of sugar is thatD．
A．It tastes sweet
B．We can save plenty of land
C．We can get more food
D．It's one of the most highly concentrated of energy foods．

分析本文主要讲述了糖在现代社会起到的重要作用，以及它在未来的日子里可能起到的用途．

解答 56．B 细节题．根据文章第一段内容，Sugar is so much a part of our modern life that we only really think about it when，for some reason，we cannot obtain it．It has been known to man for at least 3，000years，but has come into common use only in modern times．Until quite recently it was considered as a medicine and as a luxury for the very rich only．糖是我们现代生活的如此重要的一部分以至于我们有时忽视了它．但它存在已久，而且最新研究显示，它可以被用作药用．结合选项，故选B
57．D 推理题．根据文章第三段内容，About 90% of the sugar is produced as food．Only 10% is used in industry for purposes 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．大约有90% 的糖被生产作食物，仅仅只有10%被用在工业中，然而，糖有极大的可能用在化学领域，也有可能用来制造塑料，在未来这些潜在的用途都会成真，结合选项，故D符合文意
58．D 细节题．根据文章内容，There are many reasons why we should increase the production of sugar．Most important is that it is one of the most highly concentrated of energy foods我们应该大量生产糖的原因是它是能量的提供源，为人类提供能量、结合选项，故选D

点评本文是一个科教类阅读理解，题目涉及多道细节理解题，做题时结合原文和题目有针对性的找出相关语句进行仔细分析，结合选项选出正确答案．推理判断题也是要在抓住关键句子的基础上合理的分析才能得出正确答案，切忌胡乱猜测，一定要做到有理有据．

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