A:高低纬度的冷热不均形成了三圈环流
B:低纬环流和高纬环流是热力环流,中纬环流是动力环流
C:低纬环流是热力环流,中纬环流和高纬环流是动力环流
D:三圈环流上空的风向与近地面风向都相反
The man can play music. The kids walk behind him.