46. What is the writer’s main point in the first paragraph?
(A) Air pollution is especially harmful to children.
(B) Vehicles are a major cause of air pollution in cities.
(C) Cars, trucks, and buses use most of the world’s energy.
(D) Greenhouse gases are the primary cause of climate change.

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統計: A(3), B(112), C(5), D(20), E(0) #3195828

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