更多"Land pollution involves many kinds "的相关试题:
[单项选择] Land pollution involves many kinds of wastes. For many years, all wastes were dumped 61 sanitary (卫生的) landfills. Sanitary landfills are large pits where garbage is buried under layers of dirt. When hazardous wastes are put in these landfills, toxic (有毒的) substances can seep into the groundwater and enter the food chain. Hazardous wastes are those kinds of wastes that are 62 or dangerous to the environment. They can be poisonous, corrosive (腐蚀性的), flammable, explosive,
or radioactive (放射性的). They can pollute the air or 63 fires or explosions. These wastes can also cause 64 problems for humans and animals. For these reasons, it is important to dispose 65 hazardous wastes in secured landfills where they cannot leak. A secured landfill is located on clay ground, and the pits are lined with plastic and nylon sheets to 66 the hazardous wastes in the pit.
One kind of hazardous wastes, radioactive waste, involves a special disposal problem. Radioactive waste is created by industri
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