ACCORDING TO THE PASSAGE, WHAT MUST THE NATIONS OF THE WORLD DO TO...

43. According to the passage, what must the nations of the world do to find a solution?A. work together B. save their livesRead the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correctword for each of the blanks.Air pollution occurs when wastes dirty the air. People produce most of the (44) that cause airpollution. Such wastes can be in the form of gases or particles of solid or liquid matter. These substancesresult chiefly from burning (45) to power motor vehicles and to heat buildings. Industrial processesand the (46) of garbage also contribute to air pollution. Natural pollutants (impurities) include dust,pollen, soil particles, and naturally occurring gases.The rapid growth of population and industry and the increasing use of automobiles and airplanes havemade air pollution a (47) problem. The air we breathe has become so filled with pollutants that itcan cause (48) problems. Polluted air also harms plants, animals, building materials, and fabrics. Inaddition, it causes damage by altering the earth’s atmosphere.