【单选题】
A clear, cool nights when the air close to the ground is cooled by the lowering temperature of the ground
B clear, hot nights when the air close to the ground is cooled by the lowering temperature of the ground
C clear, cool day when the air close to the ground is cooled by the lowering temperature of the ground
D clear, cool nights when the air close to the ground is cooled by the increasing temperature of the ground
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