题目： What is a traditional method used to keep the soil healthy?
A、 Avoiding too much use of chemicals.
B、 Replacing soil nutrients with fertilizers.
C、 Using the soil for organic produce only.
D、 Rotating crops as much as possible.
题目： What is a traditional method used to keep the soil healthy?
A、 Avoiding too much use of chemicals.
B、 Replacing soil nutrients with fertilizers.
C、 Using the soil for organic produce only.
D、 Rotating crops as much as possible.
