单选题：Questions are based on the following passage． According to a

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 behavioraldisorders in children．The developing brain, the report says, is particularly（36） to the toxic effectsof 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 urgedU．S．government agencies to（39） the use of some of the 11 chemicals the report cites and called formore 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 ofsome of the chemicals in the latest report．
But the threshold for regulation is high．Because children's brain and behavioral disorders, likehyperactivity and lower grades, can also be linked to social and genetic factors, it's tough to pin themon exposure to specific chemicals with solid（ 43）evidence, which is what the EPA requires．Eventhe Harvard study did not prove a direct（44）but noted strong associations between exposure andrisk of behavioral issues．
Nonetheless, it's smart to（ 45）caution．While it may be impossible to prevent kids from drinkingtap water that may contain trace amounts of chemicals, keeping kids away from lawns recently sprayedwith 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