試題詳解

47. What is the main idea of the second paragraph?
(A) London has improved the air quality in the center of the city by reducing the number of cars.
(B) Air pollution has caused major public health problems in London, especially for the poor.
(C) The city can use the money from the ULEZ fees to fight pollution.
(D) London has introduced a low-emission zone as a way to reduce pollution.