TOEFL Reading: ETS-TOEFL阅读机经 - NG676U3ECPDUCOUQL$

According to paragraph 2, all of the following statements about legumes are true EXCEPT: A. Legumes have pods that help seeds ripen quickly. B. Legumes contain a lot of iron and B vitamins. C. Legumes return nitrogen to the soil. D. Legume plants can be harvested many times during a growing season.