36. What is the main purpose of this passage?
(A) To argue that traditional farming should be completely banned worldwide.
(B) To introduce vertical farming and discuss its advantages and challenges.
(C) To explain how to build a small greenhouse in an urban apartment.
(D) To advertise a specific brand of LED lights used for indoor plants.

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統計： A(0), B(2), C(0), D(0), E(0) #4070179