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imes its natural level. Carbon monoxide, however has a natural level of
0. 1 ppm and is not usually a pollutant until its level reaches about 15 ppm.
Question 43. What does the passage mainly dicuss?
A. What constitutes an air pollutant. B. How much harm air pollutants can cause.
C. The economic impact of air pollution. D. The effects of compounds added to the atmosphere
Question 44. The word “adversely” in the first paragraph is closest in meaning to .
A. considerably B. quickly C. admittedly D. negatively
Question 45. It can be inferred from the first paragraph that .
A. the definition of air pollution will continue to change.
B. Most air pollutants today can be seen or smelled.
C. a substance becomes an air pollutant only in cities.
D. water vapor is an air pollutant in localized areas.
Question 46. The word “these” in the second paragraph is closest in meaning to .
A. the compounds moved to the water or soil B. the pollutants from the developing Earth
C. the various chemical reactions D. the components in biogeochemical cycles Question 47. For which of the following reasons can natural pollutants play an important role in controlling air pollution?
A. They’re less harmful to living beings than other pollutants.
B. They function as part of a purification process.
C. They occur in greater quantities than other pollutants.
D. They have existed since the Earth developed.
Question 48. According to the passage, human- generated air pollution in localized regions .
A. will react harmfully with natural pollutants.
B. can overwhelm the natural system removing pollutants.
C. will damage area outside of the localized regions.
D. can be dwarfed by nature’s output of pollutants.
Question 49. The word “localized” in the third paragraph is closest in meaning to .
A. surrounded B. encircled C. specified D. circled
Question 50. According to the pas
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