easy · GRE Verbal
A farm used soil sensors to guide watering. It harvested the same amount of produce while using less water than the prior year.
Which phrase best identifies the passage’s central subject?
- the farm’s method for pricing harvested produce
- the history of rainfall during the prior year
- the effects of sensor-guided farm watering
- worker preferences for different field sensors
- the cost of replacing the farm’s irrigation pipes
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