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----------------------------------1、1．That might be a way to solve the food problem．2．A big progress has been made，and soon people may have to accept more“unnatural food”3．Although the birth rate has dropped in some nations，including the United States。thepopulation of the world seems sure to pass six billion as the twenty—first century opens．4．The world will find it difficult to expand production to fill the additional mouths(that is because the rich land is lost every year to industry，and some of the farmland is turned into desert)．5．With such a large population，there will be mote problems we have to deal with in the fu ture．6．There is as yet no sign that any slowing of thc world’S population is in sight．7．The food iS one of them．8．Scientists are striving to create artificial food． 参考答案： 63574821 63574821----------------------------------------1、 Choose the best topic sentence from the group below．Write the letter of the choice in the blank． A.Most smokers know about the risk of smoking．B.Some boys believe that smoking is a sign of maturity．C.Smoking indoors causes far more pollution than smoking outdoors．D.Smoking should be given up because it is harmful to people． 参考答案： D Smoking should be given up because it is harmful to people．----------------------------------------2、Read the following paragraph and underline the topic sentence．Vitamins and minerals are essential for good health．It is unnecessary tO take extra vitamins because a varied balanced diet usually supplies a full complement of all the nutrimnts you need．Vitamin deficiencies rarely occur in the United States but some people still worry about deficiencies and believe that they will he healthier if they take extra vitamins．Other people fe
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