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2015年12月英语六级真题卷二(选词填空)

1、

        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 the 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 amount of chemicals, keeping kids away from lawns recently sprayed with chemicals and freshly dry-cleaned clothes can’t hurt.