According to Paragraph 1, which of the following best explains the main idea of the book?A
According to Paragraph 1, which of the following best explains the main idea of the book?
A.U. S. government has made progress in reducing the carbon-dioxide gas.
B.Major automakers will do something to reduce the pollution produced by cars.
C.The gas emitted by cars is the source of American air pollution.
D.People should take measures to reduce air pollution.