47. What do we need in order to grow hydroponic vegetables?
(A) Fertile soil.
(B) Chemicals.
(C) Warm weather and sunlight.
(D) Fresh air and natural environment.

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統計： A(30), B(424), C(88), D(72), E(0) #814671

Ruby

B1 · 2017/07/28

#2364578

Hydroponic systems n...

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Tina

B2 · 2017/11/02

#2471283

hydroponic farms can use special material, such as charcoal and mixtures of chemicals