[简答题]

A strict vegetarian is a person who never in his life eats anything derived from animals. (46)The main objection to vegetarianism on a long - term basis is the difficulty of getting enough protein, the body - building element in food. If you have ever been without meat or other animal foods for some days or weeks(say, for religious reasons) you will have noticed that you tend to get physically rather weak. Proteins are built up from approximately twenty food elements called ’ amino - acids’ , which are found more abundantly in animal protein than in vegetable protein. This means you have to eat a great deal more vegetable than animal food in order to get enough of these amino -acids. (47) A great deal of the vegetable food goes to waste in this process and from the physiological point of view there is not much to be said in favor of life - long vegetarianism.
The economic side of the question, though, must be considered. Vegetable food is much ch

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