16.Perera and her team chose nonsmoking pregnant women all over America.
A.Right
B.Wrong
C.Not mentioned
17.The main purpose of the research was to find out how exposure to PAHs played a role in harming the subjectsphysical health.
A.Right
B.Wrong
C.Not mentioned
18.Nonsmoking mothers were selected because the effect of smoking on PAHs was unclear.
A.Right
B.Wrong
C.Not mentioned
19.The blood of each woman was tested once a month during pregnancy.
A.Right
B.Wrong
C.Not mentioned
20.Kids with ADHD commonly fail in school.
A.Right
B.Wrong
C.Not mentioned
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
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
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