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

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#2364578
Hydroponic systems n...
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#2471283
hydroponic farms can use special material, such as charcoal and mixtures      of chemicals
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