单项选择题
A.a newspaper. B.the government. C.a construction firm. D.a private company.
A.car causes pollution only in some cities. B.60% of the cities are affected by car pollution. C.90% of the city residents suffer from car pollution. D.car is the main contributing factor in polluting air.
A.Tapie. B.Helu. C.Haslip. D.Nazir-Ali.