[外语类试卷]大学英语六级模拟试卷182及答案与解析.doc
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1、大学英语六级模拟试卷 182及答案与解析 一、 Part I Writing (30 minutes) 1 Directions: For this part, you are allowed 30 minutes to write a letter. Suppose you are graduating from the university this summer and you are going to apply for a job. You should write no less than 150 words and you should base your composition
2、 on the outline given in Chinese below: 1. 假设你是一位即将毕业于复旦大学电子计算机系的学生,你从报纸上看到某公司招聘一名电子计算机工程技术口译人员的广告,请你写一封求职信说明你应聘的理由。 二、 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 attach
3、ed to the passage. For questions 1-4, mark: Y (for YES) if the statement agrees with the information given in the passage; N (for NO) if the statement contradicts the information given in the passage; NG (for NOT GIVEN) if the information is not given in the passage. 1 Calories For years now, calori
4、es have been all the rage- people are counting them and cutting them, and youd be hard-pressed to find something at the supermarket that does not list its calories per serving somewhere on the package. But have you ever wondered what exactly a calorie is? What Is A Calorie? A calorie is a unit of en
5、ergy. We tend to associate calories with food, but they apply to anything containing energy. For example, a gallon (about 4 liters) of gasoline contains about 31,000,000 calories. Specifically, a calorie is the amount of energy, or heat, it takes to raise the temperature of 1 gram of water 1 degree
6、Celsius (1.8 degrees Fahrenheit). One calorie is equal to 4. 184 joules ( 焦耳 ), a common unit of energy used in the physical sciences, Most of us think of calories in relation to food, as in “This can of soda has 200 calories.“ It turns out that the calories on a food package are actually kilocalori
7、es (1,000 calories= 1 kilocalorie). The word is sometimes capitalized to show the difference, but usually not. A food calorie contains 4,184 joules. A can of soda containing 200 food calories contains 200,000 regular calories, or 200 kilocalories. A gallon of gasoline contains 31,000 kilocalories. T
8、he same applies to exercise - when a fitness chart says you burn about 100 calories for every mile you jog, it means 100 kilocalories. For the duration of this article, when we say “calorie“, we mean “kilocalorie“. What Calories Do? Human beings need energy to survive - to breathe, move, pump blood
9、- and they acquire this energy from food. The number of calories in a food is a measure of how much potential energy that food possesses. A gram of carbohydrates(碳水化合物 ) has 4 calories, a gram of protein has 4 calories, and a gram of fat has 9 calories. Foods are a compilation of these three buildin
10、g blocks. So if you know how many carbohydrates, fats and proteins are in any given food, you know how many calories, or how much energy, that food contains. If we look at the nutritional label on the back of a packet of maple-and-brown-sugar oatmeal, we find that it has 160 calories. This means tha
11、t if we were to pour this oatmeal into a dish, set the oatmeal on fire and get it to burn completely (which is actually pretty tricky), the reaction would produce 160 kilocalories (remember: food calories are kilocalories) - enough energy to raise the temperature of 160 kilograms of water 1 degree C
12、elsius. If we look closer at the nutritional label, we see that our oatmeal has 2 grams of fat, 4 grams of protein and 32 grams of carbohydrates, producing a total of 162 calories (apparently, food manufacturers like to round down). Of these 162 calories, 18 come from fat (9 calx2 g), 16 come from p
13、rotein (4 cal4g) and 128 come from carbohydrates (4 cal32g). Our bodies “burn“ the calories in the oatmeal through metabolic (新陈代谢的 ) processes, by which enzymes(酵素 ) break the carbohydrates into glucose( 葡萄糖 ) and other sugars, the fats into glycerol (丙三醇 ) and fatty acids and the proteins into ami
14、no acids(氨基酸 ). These molecules are then transported through the bloodstream to the cells, where they are either absorbed for immediate use or sent on to the final stage of metabolism in which they are reacted with oxygen to release their stored energy. Your Caloric Needs Just how many calories do o
15、ur cells need to function well? The number is different for every person. You may notice on the nutritional labels of the foods you buy that the “percent daily values“ are based on a 2,000 calorie diet. 2,000 calories is a rough average of what a person needs to eat in a day, but your body might nee
16、d more or less than 2,000 calories. Height, weight, gender, age and activity level all affect your caloric needs. There are several factors that regulate how many calories we need each day. Some of these considerations are your metabolic rate (新陈代谢率 ), physical activity level and thermic (热的 ) effec
17、t of food, sleep patterns, age, gender, body mass and body size. To determine your caloric intake value for building mass, multiply your body weight by 24, while multiplying your body weight by 17 to determine your approximate maintenance level caloric intake. The main function of carbohydrates is t
18、o be a source of energy for the body. In the end, energy drawn from the breakdown of glucose and glycogen (肝糖 ) is used to fuel muscular contractions as well as provide a “protein sparing“ effect. Unlike the other macro-nutrients, proteins contain nitrogen (氮 ) which is important in the formation of
19、 new muscle tissue. The human body requires 22 different amino acids, which are found in protein, and can be classified as either essential or non-essential. Essential amino acids cant be synthesized in the body, while non-essential amino acids can be. Under normal conditions, protein serves an impo
20、rtant role in the maintenance, repair, and growth of body tissues. Proteins make up about 15% of your total body mass and have several roles in the body. Proteins also regulate the acid/base quality of body fluids and are necessary for muscle contractions, hormone production, and the activation of m
21、etabolic processes. In the human body, fat provides the largest store of potential energy, produces hormones, strengthens cell structures, transmits nerve impulses and provides insulation (绝热 ) from cold environments. Fats actually contribute to about 50 % of the energy required during light and mod
22、erate exercise, and this percentage rises as the work period is prolonged. Calories, Fat and Exercise So what happens if you take in more or fewer calories than your body burns? You either gain or lose fat, respectively. An accumulation of 3,500 extra calories is stored by your body as 1 pound of fa
23、t - fat is the bodys way of saving energy for a rainy day. If, on the other hand, you bum 3,500 more calories than you eat, whether by exercising more or eating less, your body converts 1 pound of its stored fat into energy to make up for the deficit. One thing about exercise is that it raises your
24、metabolic rate not only while youre huffing and puffing(忙得喘不过气来 ) on the treadmill (踏车 ). Your metabolism takes a while to return to its normal pace. It continues to function at a higher level; your body hums an increased number of calories for about two hours after youve stopped exercising. Lots of
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