TOEFL Reading: ETS-TOEFL阅读机经 - 85OON3K05LG3Y7F5L$

According to paragraph 5, which of the following best describes an agricultural practice of the settlers? A. They abandoned European grains, which were not as productive as corn. B. They planted certain crops close together to support and improve growth. C. They created structures to protect and cover corn and bean D. They planted more corn than other crops because it supplied the structure to climb