37. According to the passage, what is one of the methods used in vertical farming?
(A) Growing crops in nutrient-rich water.
(B) Planting seeds in highly fertile, traditional soil.
(C) Using heavy diesel machinery to harvest crops.
(D) Spraying chemical pesticides to prevent bugs.

答案：登入後查看
統計： A(0), B(0), C(1), D(1), E(0) #4070180