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el that extra Vitamins are effective in curing or preventing diseases．What can happen if you take large amounts of vitamins?In most cases，vitamins are absorbed in the correct proportions and the rest leave the body．However，vitamins A and D remain in the fat tissue and can result in vitamin poisoning．The full effect of vitamins on the body has not been determined，and some experts question whether we need to fortify ourselves with extra V1tamlns． 参考答案： It is unnecessary to take extra vitamins because a varied balanced diet usually supplies a full complement of all the nutrients you need． It is unnecessary to take extra vitamins because a varied balanced diet usually supplies a full complement of all the nutrients you need．----------------------------------------3、Read the following paragraph carefully and select the best topic sentence from the four possible answers that follow the paragraph．Topic Sentence：Isaac Asomov is noted by scientist and science fiction writer．He has a remarkable gift for being able to explain complex science phenomena in ways the ordinary person can easily understand．Asomov was recently asked to imagine and describe what would happen tO everyday life in 1997 if fuel really began running out．Next paragragh is the fiction that Isaac Asomov writes．Hello，My name is Iara，and I want to tell you about my life．It is 1997 now，and I am nine years old．I live in a small city，and my father and mother ride bicycles tO work．We have a garden，and we grow almost all of our vegetables．There are community gardens in every neighborhood also．These gardens used tO be parked lots，but now there are almost no cars，so this land is used for gardens．The air is much cleaner now than it used tO be accord ing to my parents．They tell me that the cars caused a lot of
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