The human body is a living machine, and, like all machines, it needs "fuel&

         Thehuman body is a living machine, and, like all machines, it needs"fuel" （燃料） to supply it with energy．This is provided by the food we eat．But how much do we need to stay healthy?

         Theenergy value of food is usually measured in calories．A calorie is the amount of heatrequired to raise the temperature of 1 kg of water by 1℃．The number of calories peopleneed per day is different．Also, the number of calories you use at any one moment normallydepends on the activity you are in．For example, you need more calories for standing than for sitting,more for running than for walking, and so on．

         Theenergy in food is in the form of three kinds of chemical materials-carbohydrate（碳水化合物）, protein（蛋白质）and fat．Carbohydrate provides 3．8 Cal/gm, protein 4．0 Cal/gm, and fat 8．8 Cal/gm．Each food contains differentamount of these materials, as the round pictures show．

1．The amount of calories supplied by equal amounts of milk, rice, andpeanuts is the largest in the case of ________．

         A．milk             B．rice               C．peanuts        D．rice or peanuts

2．Choose one statement from among A-D that agrees with the passage andthe pictures above．

         A．You need more calories forswimming than for mountain climbing．

         B．Food contains energy in theform of carbohydrates, proteins and fuel．

         C．Different people need differentamounts of energy depending on their age, sex and the activities they are in．

         D．3 grams of milk provides 16．6 calories because carbohydrateprovides 3．8Cal/gm, protein 4．0Cal/gm and fat 8．8Cal/gm．

3．This article mainly tells us ________．

         A．all the energy is in food           B．the human body needs energy

         C．the number of calories dependson your activity

         D．we must only eat peanuts to getcalories

试题答案

【答案】

 C

 C

 B

【解析】