TOEFL Reading: ETS-TOEFL阅读机经 - 67E45R6LMQNFH611L$

Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information. A. The change to land cultivation was a slow process because humans were familiar with the needs of relatively few plants and animals. B. The cultivation of land occurred gradually as it was the product of extensive human experience observing plants and animals of value to humans. C. Gardens, fields, and pastures were outgrowths of the desire for plants and animals that humans knew from long familiarity were good to eat, wear, or ride. D. People learned about environmental requirements, growth cycles, and reproductive mechanisms through their long familiarity with plants and animals that they liked to eat, ride, and wear.