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We can tear apart the great grass cover of the western plains and pour toxic chemicals into the soil until the soil is dead and blows away in the wind.
出自-2013年12月听力原文
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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 33 statistical evidence, which is what the EPA re
2015年12月六级真题（第一套）阅读 Section A
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Health and environmental advocates have long urged U.S.government agencies to tighten the use of some of the 11 chemicals the report cites and called for more studies on their long-term effects.
2015年12月六级真题（第一套）阅读 Section A
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The agency is now investigating the toxic effects of some of the chemicals in the latest report.
2015年12月六级真题（第一套）阅读 Section A
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The developing brain, the report says, is particularly vulnerable to the toxic effects of certain chemicals these products may contain, and the damage they cause can be permanent.
2015年12月六级真题（第一套）阅读 Section A
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The Tanzanian government has once again started mining the lake for soda ash, used for making chemicals, glass and detergents.
2017年12月六级真题（第三套）阅读 Section C
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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.
2015年12月六级真题（第一套）阅读 Section A