TOEFL Listening: ETS-TOEFL听力机经 - OJE452GZY8X3ZU1XP$

According to the professor, what might be the practical application of studying the diet of white-throated sparrows? A. It will help Block Island farmers protect their crops. B. New methods of determining changes in diet can be developed. C. Feeding white-throated sparrows will prevent them from migrating in the winter. D. Migrating white-throated sparrows will be provided with the most appropriate diet.