TOEFL Reading: ETS-TOEFL阅读机经 - 2V54JOT286L3J793L$

Paragraph 4 indicates which of the following about shifting agriculture A. It allowed farmers to cultivate cereal crops without reducing the size of their herds. B. It allowed farmers to cultivate a variety of crops at the same time. C. It enabled farmers to cultivate crops with minimal equipment and effort. D. It enriched the soil and produced large yields of crops over the years.