This incomplete text is for numbers 38 to 40. We live in the town. Theremust be air pollution. The largest 38) of air pollution in cities is from vehicle exhaust fumes. People must know that air pollution has bad effects for us. Air pollution causes irritation in the throat, nose, lungs, and eyes. It 39) breathing problems and aggravates existing health conditions such as asthma. People who exercise outdoors are susceptible to the adverse effects of air pollution because it involves deeper and faster breathing. Acid rain contains hydrogen ions, which can damage trees, crops, harm marine animals, and induce corrosion in metals. Smog causes harmful health 40) in humans and animals. Studies have shown signs of black lung disease in dolphins of due to high concentrations of carbon particles in the air. People afflicted with heart disease, children and older people are more sensitive to air pollution. In conclusion, I think air pollution can be dangerous for humans and environments. 39)

Question

This incomplete text is for numbers 38 to 40.

We live in the town. There must be air pollution. The largest 38) ____ of air pollution in cities is from vehicle exhaust fumes. People must know that air pollution has bad effects for us. Air pollution causes irritation in the throat, nose, lungs, and eyes. It 39) ____ breathing problems and aggravates existing health conditions such as asthma. People who exercise outdoors are susceptible to the adverse effects of air pollution because it involves deeper and faster breathing. Acid rain contains hydrogen ions, which can damage trees, crops, harm marine animals, and induce corrosion in metals. Smog causes harmful health 40) ____ in humans and animals. Studies have shown signs of black lung disease in dolphins of due to high concentrations of carbon particles in the air. People afflicted with heart disease, children and older people are more sensitive to air pollution. In conclusion, I think air pollution can be dangerous for humans and environments.

39) ____

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