TOEFL Reading: ETS-TOEFL阅读机经 - T4MKR5979N8D_6JUL$

The solution for unpredictable rainfall described in paragraph 5 involved all of the following EXCEPT A. planting crops in many different places, regardless of predicted rainfall B. using a simple political and social system for the coordination of agricultural activities C. harvesting crops from those sites that did receive adequate rain D. sharing harvested crops with people whose crops did not grow well