What are the main sources of traffic noise in the city? a) ( ) They are the motors and exhaust system of planes, bigger trucks, buses and bikes. b)...
What are the main sources of traffic noise in the city?
a) ( ) They are the motors and exhaust system of planes, bigger trucks, buses and bikes.
b) ( ) They are the motors and exhaust system of autos, smaller trucks, buses and motorcycles.
c) ( ) They are the motors and exhaust system of autos, bigger trucks, planes and motorcycles.
d) ( ) They are the motors and exhaust system of planes, smaller trucks, bikes and motorcycles.
a) ( ) They are the motors and exhaust system of planes, bigger trucks, buses and bikes.
b) ( ) They are the motors and exhaust system of autos, smaller trucks, buses and motorcycles.
c) ( ) They are the motors and exhaust system of autos, bigger trucks, planes and motorcycles.
d) ( ) They are the motors and exhaust system of planes, smaller trucks, bikes and motorcycles.
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Ed 
A principal fonte de ruído do tráfego na cidade são os motores e sistemas de exaustão de automóveis, caminhões maiores, ônibus e motocicletas. Portanto, a alternativa correta é a letra c).
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