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ADHD Linked to Air Pollutants
Children have an increased risk of attention problems,seen as early as grade school , if their moms inhaled(吸入)a certain type of air pollution when they were pregnant. That's the finding of a new study. Released when things aren't burned completely, this pollution is known as polycyclic aromatic hydrocarbons, or PAHs. The biggest sources of these PAHs: the burning of fossil fuels, wood and trash.

20. Kids with ADHD commonly fail in school.
A. Right
B. Wrong
C. Not mentioned
环球网校参考答案C
21. The women with high levels of PAHs in their blood were more likely to have kids with ADHD
A. Right
B. Wrong
C. Not mentioned
环球网校参考答案A
22. Traffic and home heating were considered to be the biggest sources of PAHs for the subjects in the research.
A. Right
B. Wrong
C. Not mentioned
环球网校参考答案 A
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