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  3. Congested cities are fast becoming test tubes for scientists studying the impact of traffic fumes on the brain. As roadways cho

Congested cities are fast becoming test tubes for scientists studying the impact of traffic fumes on the brain. As roadways cho

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问题     Congested cities are fast becoming test tubes for scientists
studying the impact of traffic fumes on the brain. As roadways
choke on traffic, researchers suspect that the tailpipe exhausted【M1】______
from cars and trucks—especially tiny carbon particles already
implicated heart disease, cancer and respiratory ailments—may【M2】______
also injure brain cells the key to learning and memory. New【M3】______
public-health studies and laboratory experiments suggest that, at
every stage of life, traffic fumes exact a measuring toll on mental【M4】______
capacity, intelligence and emotional stability.
    Children in areas affected by high levels of emissions, on
average, scored more poor on intelligence tests and were more【M5】______
prone to depression, anxiety and attention problems than children
growing in cleaner air, separate research teams in New York,【M6】______
Boston, Beijing, and Krakow, Poland, found. And older men and
women long exposing to higher levels of traffic-related particles【M7】______
and ozone had memory and reasoning problems effectively added【M8】______
five years to her mental age, other university researchers in Boston【M9】______
reported this year. The emissions may also height the risk of【M10】______
Alzheimer’s disease and speed the effects of Parkinson’s disease.
    "The evidence is growing that air pollution can affect the
brain," says medical epidemiologist Heather Volk at USC’s Keck
School of Medicine. "We may be starting to realize the effects are
broader than we realized."
【M3】
选项
答案the一去掉the
解析 词汇错误。本句意为“研究人员怀疑。各类轿车和卡车释放的尾气可能还会伤害对学习和记忆起关键作用的脑细胞”，此处key不是名词．而是形容词作后置定语修饰前面的brain cells。意思是“关键的”，因此此处应删掉定冠词the。
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