Farmers in central spain who practice dry a. grow crops that do not need water b. leave land unplanted to gather moisture c. are not affected by climate d. use irrigation from navigable rivers

B.leave land unplanted to gather moisture
 This is the traditional practice. Today, dry planting techniques include mulching after a short rain,which stops moistures from evaporating. dry planting produces are very delicious,especially wines.

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According to new research, more than 5..5 million deaths are associated with polluted air. hope this : ).