A) good,posing little or no risk to sensitive groups.
B) acceptable for all but the most highly sensitive groups.
C) unhealthy for sensitive groups,including older adults and children.
D) very unhealthy for all people,resulting in a public health alert.
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A) week.
B) month.
C) year.
D) decade.
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Multiple Choice
A) By 2030,the polar ice could melt away completely during the summer months.
B) Since 2007,there has been less polar ice melting than there was from 2000 to 2006.
C) Experts now believe that polar ice melting will not be a problem for future generations.
D) Polar ice melts help to stabilize global weather patterns.
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True/False
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Multiple Choice
A) an SUV
B) an HEV
C) a conventional midsize car
D) a conventional compact car
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Multiple Choice
A) fertility rates
B) habitat destruction
C) death rates
D) availability of family planning
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Multiple Choice
A) level of carbon monoxide over the previous ten days.
B) deterioration in the ozone layer.
C) concentration of five air pollutants of concern to health.
D) amount that visibility is diminished by smog.
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Multiple Choice
A) vector transmission.
B) biomagnification.
C) bioloading.
D) radiation sickness.
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True/False
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True/False
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True/False
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Multiple Choice
A) forest fires
B) battery-driven golf carts
C) blooming flowers
D) dust storms
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Multiple Choice
A) AntarcticA.
B) the United States.
C) the equator.
D) Africa.
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True/False
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Multiple Choice
A) microwave
B) infrared
C) gamma
D) X-ray
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Multiple Choice
A) arthritis.
B) mental retardation.
C) cancer.
D) birth defects.
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Multiple Choice
A) lung cancer.
B) lymphoma.
C) skin cancer.
D) leukemia.
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Multiple Choice
A) acid rain.
B) global warming.
C) ecological homeostasis.
D) smog.
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True/False
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