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．a(chǎn)bout 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 本文主要講述了糖在現(xiàn)代社會起到的重要作用，以及它在未來的日子里可能起到的用途．

解答 56．B 細節(jié)題．根據(jù)文章第一段內容，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．糖是我們現(xiàn)代生活的如此重要的一部分以至于我們有時忽視了它．但它存在已久，而且最新研究顯示，它可以被用作藥用．結合選項，故選B
57．D 推理題．根據(jù)文章第三段內容，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．大約有90% 的糖被生產(chǎn)作食物，僅僅只有10%被用在工業(yè)中，然而，糖有極大的可能用在化學領域，也有可能用來制造塑料，在未來這些潛在的用途都會成真，結合選項，故D符合文意
58．D 細節(jié)題．根據(jù)文章內容，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我們應該大量生產(chǎn)糖的原因是它是能量的提供源，為人類提供能量、結合選項，故選D

點評 本文是一個科教類閱讀理解，題目涉及多道細節(jié)理解題，做題時結合原文和題目有針對性的找出相關語句進行仔細分析，結合選項選出正確答案．推理判斷題也是要在抓住關鍵句子的基礎上合理的分析才能得出正確答案，切忌胡亂猜測，一定要做到有理有據(jù)．

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科目：高中英語 來源： 題型：閱讀理解

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