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单选题Questions are based on the following passage．
According to a report from the Harvard School of Public Health, many everyday products, including some bug sprays and cleaning fluids, could lead to an increased risk of brain and behavioral disorders in children．The developing brain, the report says, is particularly （36） to the toxic effects of certain chemicals these products may contain, and the damage they cause can be （37） ．
The official policy, however, is still evolving．Health and environmental （38） have long urged U．S．government agencies to （39） the use of some of the 11 chemicals the report cites and called for more studies on their long-term effects．In 2001, for example, the Environmental Protection Agency（40）the type and amount of lead that could be present in paint and soil in homes and child-care （41）, after concerns were raised about lead poisoning．The agency is now （42）the toxic effects of some of the chemicals in the latest report．
But the threshold for regulation is high．Because children's brain and behavioral disorders, like hyperactivity and lower grades, can also be linked to social and genetic factors, it's tough to pin them on exposure to specific chemicals with solid （ 43）evidence, which is what the EPA requires．Even the Harvard study did not prove a direct（44）but noted strong associations between exposure and risk of behavioral issues．
Nonetheless, it's smart to（ 45）caution．While it may be impossible to prevent kids from drinking tap water that may contain trace amounts of chemicals, keeping kids away from lawns recently sprayed with chemicals and freshly dry-cleaned clothes can't hurt．
A．advocates
B．compact
C．correlation
D．exercise
E．facilities
F．interaction
G．investigating
H．overwhelmed
I．particles
J．permanent
K．restricted
L．simulating
M．statistical
N．tighten
O．vulnerable
第（36）题选
参考答案O
解析:vulnerable。详解：该空格位于主系表结构的句子中，处于系动词is之后．介同to之前，且空格处所填单词被副词particularly所修饰，综合考虑，此处应填入形容词vulnerable，本句含义为“孩子们正在发育的大脑易受伤害”，be vulnerable to为固定搭配，表示“易受……的伤害”．故答案为O．vulnerable“脆弱的，易受伤害的”。备选项里的compact，permanent，statistical与上下文语义不符．故均排除。