TOEFL Listening: ETS-TOEFL听力机经 - M1W24911J4Z03PO8P$

What did the results of the fruit fly study suggest? A. Insects' cells may not produce free radicals. B. Some insects naturally produce large quantities of SOD. C. Antioxidants can slow the rate of aging in some organisms. D. Various antioxidants may work together to repair cell damage.