该图示意不同纬度四地白昼长度变化。若该图表示上半年a、b两月

该图示意不同纬度四地白昼长度变化。若该图表示上半年a、b两月(a月早于b月)，则①②③④四地纬度依次是 (　　)

A．66.5°S、66°S、0°、40°N

B．66.5°S、66°S、40°S、40°N

C．40°S 、66.5°N、66°N、0°

D．66.5°N、66°N、40°N、40°S

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