TOEFL Listening: ETS-TOEFL听力机经 - Z4CW3W39TVY0B381P$

The professor mentions research findings on the number of bacterial cells in the human body. What is her opinion of these findings? A. She is confused by the inconsistency of the various findings. B. She accepts the validity of the findings. C. She expects that future research will show that the estimates are too high. D. She regrets that researchers did not include counts of bacteria in the digestive system.