【单选题】听力原文: The economic costs of noise to society are several. Airports are currently operating at less capacity because of noise regulations which restrict their hours of operation.For instance, at Washin...
A.
It is extremely dangerous to fly in the dark.
B.
Noise regulations restrict the hours of airport operation.
C.
Some of its runways are not in good condition.
D.
Cargo planes produce more disturbing noises at night.