您当前的位置:大学英语四级 > 大学英语四级模拟试题 > 浏览文章

2009年12月英语四级考试模拟训练及答案(一)

来源:未知 作者:admin 时间:2009-11-01 23:01:17 字体:[ ]
2009年12月英语四级考试模拟训练及答案,独立演练,自测之后再对答案效果好。

  00-1

  Part Ⅰ Writing (30 minutes)

  Directions: For this part, you are allowed 30 minutes to write a short essay entitled The Popularity of Getting Certificates on Campus. You should write at least 150 words following the outline given below.

  1.大学校园内各种证书的报考十分火热

  2.大学生考证的利弊

  3.考证面前,我的选择

  The Popularity of Getting Certificates on Campus

  Part Ⅱ Reading Comprehension (Skimming and Scanning) (15 minutes)

  Directions: In this part, you will have 15 minutes to go over the passage quickly and answer the questions on Answer Sheet 1.

  For questions 1-7, choose the best answer from the four choices marked A), B), C) and D). For questions 8-10, complete the sentences with the information given in the passage.

  Main Energies for the Body

  A balanced diet is one that provides an adequate intake of energy and nutrients for maintenance of the body and therefore good health. A diet can easily be adequate for normal bodily functioning, yet may not be a balanced diet.

  Carbohydrates

  Carbohydrates are a rapid source of energy, they are the body's fuel. The bulk of a balanced diet should be made from carbohydrates. If eaten in an excess of the dietary requirements carbohydrates are easily stored as fats in the cells, although carbohydrate is the first source of energy in the body. An average adult requires about 12,000kJ of energy a day, most of this is supplied by the respiration of carbohydrates in the cells.

  Carbohydrates are used principally as a respiratory substrates, i.e. to be oxidized to release energy for active transport, macromolecule synthesis, cell division and muscle contraction. Carbohydrates are digested in the duodenum and ileum and absorbed as glucose into cells. Sources of carbohydrates such as starch are rice, potatoes, wheat and other cereals. Sugars are also carbohydrates, sources of sugars are refined sugar - sucrose, which is a food sweetener and preservative and fruit sugars - fructose. If the diet lacks carbohydrate stores of fat are mobilized and used as an energy source.

  Proteins

  Protein is not a direct source of energy in the body, it is used primarily for growth and repair of body tissues while remaining an energy source as a last resort. Proteins fulfill a wide variety of roles in the body. They are broken down in the stomach and intestines to amino acids which are then absorbed. The body can only form 8 amino acids to build proteins from, the diet must provide Essential Amino Acids (EAAs) which are synthesized into proteins which can be structural, i.e. collagen in bone, keratin in hair, myosin and actin in muscle; metabolic enzymes, hemoglobin, protective antibodies and communicative hormones.

  Sources of protein include meat, fish, eggs and pulses. The diet needs to provide 8 EAAs as the body is unable to synthesis proteins without these molecules. 2 other amino acids are synthesized from EAAs so if the diet lacks the original EAAs these other two will not be present either. Phenylalanine is converted to tyrosine and methionine is converted to cysteine. Cells draw upon a pool of amino acids for protein synthesis which either come from dietary protein digested and absorbed in the gut and the breakdown of body protein such as muscle. However, unlike fats and carbohydrates there is no store of amino acids for cells to draw on, any amino acid in excess of immediate bodily requirements is broken down into urea and excreted. It is therefore important to maintain the dietary intake of protein everyday. If the body lacks protein, muscle wasting occurs as muscle is broken down.

相关英语四级文章
最新评论共有位网友发表了评论
发表评论
评论内容:不能超过250字,需审核,请自觉遵守互联网相关政策法规。
用户名: 密码:
匿名评论

精彩专题

大学英语四级模拟试题热门文章

大学英语四级模拟试题推荐文章

大学英语四级模拟试题热评文章