Question

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原文：维持生命必须的食物有三类。一是碳水化合物。碳水化合物广泛存在于动、植物，包括糖、淀粉及纤维分子（cellulose），为人类提供能量。碳水化合物还能合成生物过程所必须的葡萄糖和酶（enzymes）。二是脂肪。脂肪是比碳水化合物更为“浓缩”的食物能量，但是，它只作为储存能量而不是立即可用的能量。三是蛋白质。蛋白质是由含碳、氢、氧和氮元素的大分子组成的。蛋白质主要不是用于提供能量，而是组成生命所必须的结构物质。

Answer 1

ther are three kinds of food to maitain lfe.first is carbohydrate,which synthesis the nessissary
glucose and enzymes of biological process is widely in annimals and plants,it contains sugar,starch and cellulose .all of them can provide energy for people.the second is fat,which is more condenser food energy than carbohydrate ,butit only can be used as saving energy than using energy. the third is protain,which is composed of macromolecules like hydrogen,oxygen and nitrogen.it is not to provide energy ,but the necessary material to build a life.

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Answer 2

There are three kinds of foods to maintain fundamental necessity for life. The first kind is carbohydrate, which, including sugar, amylum and cellulose, exsits in organisms as of animals and plants and may also supply human body with energy. Besides, carbohydrate could also compose glucose and cellulose in need during the biological (metabolism) process. The second is fat, the one as a more concentrated food energy than carbohydrate and being regarded as the storage energy rather than available energy. Then comes protein as the third kind. Protein as made by macromolecules from elements such as carbon, hydrogen, oxygen plus nitrogen is not an energy supplement but rather a necessary structure substance to make up organisms.

Answer 3

The most necessary food that maintain people's life includes three kinds.The first one kind of it is carbohydrates.Carbohydrates largely exist in animals and plants ,it incldes surger starch and cellulose,it also provides people with energy and can compound glucose and enzymes that must need in the process of it .The second kind of it is fat.Fat is a more concentrated kind of energy than carbohydrates.But it can only be stored energy rather than the Immediately available energy .The last kind of it is protein. protein is made of macromolecules that include carbon, hydrogen, oxygen and nitrogen element .Protein is not mainly used for providing energy,but an necessary structure material our life needs.

Answer 4

Maintain life must have three kinds of food. One is the carbohydrates. Carbohydrates exist widely in plant and animal, include sugar, starch and fiber cellulose, provide the energy for human beings. Carbohydrates can also synthesis of necessary to the process glucose and enzymes . 2 it is fat. Is fat than carbohydrate more "enrichment" food energy, but it only as a store energy and not immediately available energy. Three are proteins. Proteins are made up of carbon, hydrogen, oxygen and nitrogen element composed of large molecules. Protein is not used to provide energy, but life must the structure of matter.应该OK啦。