Under federal law, foods and vegetables can be 1. ______ organic if they grow without conventional pesticides or petroleum-based fertilizers (有机肥料). As a result, organic foods contain fewer 2. _______ residues. But it is unclear whether this really makes the food more healthful since pesticide levels in regular produces have not been 3. ______ to pose a healthy 4. _______ to humans.Another claim is that organic produce is more nutritious than the conventional kind. The 5. _______ for this is mixed with most studies finding no advantage for organic. Then there is a 6. _____ that organic produce is less likely to be 7. ___________ by bacteria like E. coli (大肠(杆)菌). In this case, the answer is clear — not true.What about meat and dairy products labeled organic? This means they came from animals that were not given growth hormones or anti-biotics. Though some researchers suggest that hormones in food could be 8. __________ to certain cancers and early puberty(青春期), it is a matter of scientific 9. ______. There's greater agreement that anti-biotics in the food supply may help spawn so-called “superbugs”(超级病菌) and 10. _____ us in a resistance treatment.