Gap Fill - Car Fumes - Level 1


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   adults      air      connections      laboratory      networks      people      scans      traffic      windows      worried  

Paragraph 2

The study was on 25 . They breathed car fumes in a . Scientists took brain of the adults for two hours. The scans showed that the thinking in the brain changed. There were fewer between the networks. Another professor was by how traffic pollution changed the networks. She said should close car when in . The brains of the 25 people were OK after they breathed clean .

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