TOEFL Listening: ETS-TOEFL听力机经 - KE2Z1HI23123ZOBOP$

How does the professor organize the information on digestive systems? A. From an overview on common elements of digestion between protozoa and humans to detailed descriptions and the differences between them B. From an introduction to simple digestion in protozoa and humans to a discussion of more complex digestion in both types of organism C. From less essential aspects of ingestion and digestion in protozoa and humans to more significant aspects D. From a review of the process of ingestion to an illustration of the subsequent digestion seen in various organisms