2013年3月2日雅思阅读考题回顾.docVIP

2013年3月2日雅思阅读考题回顾 来源：朗阁培训中心　　编辑：xm　　发布日期:2013-03-05 摘要：厦门朗阁培训中心为烤鸭们整理了3月2日雅思阅读考题回顾以及备考建议。 考试日期： 2013年3月2日 Reading Passage 1 Title: New Energy in USA Question types: True/False/Not Given; Flow Chart; Short Answer Questions 文章内容回顾 美国的一种新能源，关于从玉米中提取乙醇为燃料。文 英文原文阅读 Ethanol is also called ethyl alcohol or grain alcohol. Its made from a fermented mixture of corn, yeast, sugar, and water. The resulting alcohol is 100 to 200 proof (200 proof is pure alcohol). In addition to use in the lab, ethanol is a popular fuel alternative and gasoline additive. Because it is flammable, ethanol can be prohibitively expensive to ship, so it may make sense to distill your own. Anyone can have a still, but be advised you may need to get a permit in order to make ethanol. Difficulty: Easy Time Required: 3 - 10 days, sometimes longer Heres How: If you are starting with whole corn, you first need to convert the cornstarch into sugar by sprouting the corn. Place the corn in a container, cover it with warm water, and drape a cloth over the container to prevent contamination and conserve heat. Ideally, the container will have a slowly draining hole at the bottom. Add warm water from time to time as the liquid level falls. Maintain the setup ~3 days or until the corn has sprouts about 2 inches long. Allow the sprouted corn to dry. Then grind it into meal. Alternatively, start with cornmeal. Other grains can be prepared in much the same way (e.g. rye mash). Mash or mush is made by adding boiling water to the corn meal. The mash is kept warm to start the fermentation process. Yeast is added, if available (half pound yeast per 50 gallons of mash, for example), and sugar (variable recipe). With yeast, fermentation takes about 3 days. Without yeast, fermentation could require more than 10 days. The mash is ready to run once it stops bubbling. The mash has been converted into carbonic acid and alcohol. It is called wash or beer or sour mash. The wash is placed into a cooker, which has a