跟踪导练(六)

阅读理解In the most comprehensive study carried out into the nutritional content of organic food (有机食品)compared to ordinary food, scientists found no large difference in vitamins and minerals.A separate study has found there are no extra health benefits by eating organic food rather than food grown on ordinary farms.The study is likely to come as a blow to the billion-pound industry which is already struggling in the economic downturn as shoppers turn away from more expensive goods. 下载全文