A. the increased solar energy
B. population migration
C. The increased harvest yield per hectare
D. temperature inversion
E. the rapid development of cities in the north
Correct Answer:
Option B – population migration
A. the increased solar energy
B. population migration
C. The increased harvest yield per hectare
D. temperature inversion
E. the rapid development of cities in the north
Correct Answer:
Option B – population migration
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