Directions：There are 20 blanks in the following passage．For each blank there are four choices marked A)，B)，C)and D) on the right side of the paper．You should choose the ONE that best fits into the passage.

Are organically grown foods the best food choicesThe advantages claimed for such foods over (67) grown and marketed food products are now being debated. (68) of organic foods-a term whose meaning varies greatly-frequently proclaim that (69) products are safer and more nutritious than others． The growing interest of (70) in the safety and nutritional quality of the typical North American diet is a welcome development. (71) ，much of this interest has been sparked by sweeping claims that the food supply is unsafe or inadequate in meeting nutritional needs.Although most of these (72) are not supported by scientific evidence，the preponderance(优势)of written material (73) such claims makes it difficult for the general public to separate fact from (74) ．As a result，claims that eating a diet 75 entirely of organically grown foods prs or (76) disease or provides other benefits to health have become widely 77 and form the basis for folklore．Almost daily the public is (78) by claims for“no-aging”diets，new vitamins and other (79) foods．There are numerous unsubstantiated reports that (80) vitamins are superior to synthetic ones，that fertilized eggs are nutritionally (81) than unfertilized eggs and the (82) ． One thing that most organically grown food products seem to have in common is that they (83) more than conventionally grown foods．But in many cases consumers are (84) if they believe organic foods can maintain health and provide better nutritional quality than conventionally grown foods．So there is real cause for concern if consumers particularly those with (85) incomes，distrust the (86) food supply and buy only expensive organic foods instead．

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