B. A great amount of meat is consumed every year. ' C. Merciless killing of the animals lowers their quality. D. They may contain antibiotics and growth hormones. 53. In the last paragraph, people are advised to_______. A. eat traditional produce and meat B. return to mass-produced fruits C. do the cost and availability research D. try organic product for better health and taste 54. This passage is mainly about________. A. the benefits of organic food information B. the challenges facing the world food industry C. changes in food production practices D. a growing demand for high quality food
Passage Five Drinking wastewater? The idea may sound distasteful, but new federally funded research says more Americans are doing so—whether they know or not—and this reuse will be increasingly necessary as the U. S. population expands. Treated wastewater poses no greater health risks than existing water supplies and, in some cases, may be even safer to drink, according to a report released by the National Research Council. “We believe water reuse is an option to deal with growing water scarcity, especially in coastal areas,” says Jorg Drewes,an engineering professor at the Colorado School of Mines. “This can be done reliably without putting the public at risk,” he says, citing technological advances. He says it’s a waste not to reuse the nation’s wastewater, because almost all of it is treated before discharge. This water includes storm runoff (径流)as well as used water from homes, businesses and factories. In many places, the report says, the public does not realize it’s drinking water that was treated after being discharged as wastewater somewhere upstream: For example, wastewater discharged into the Trinity River from Dallas/Fort Worth flows south into Lake Livingston, the source for Houston's drinking water. Despite the growing importance of this reuse, the report says there’s no systemic analysis of its extent nationwide since a 1980 study by the U.S. Environmental Protection Agency (EPA). Alan Roberson of the American Water Works Association says wastewater reuse is common, so the council’s report is important but not surprising. Roberson expects this recycling will continue to increase, especially for irrigation and industrial needs. He says it will take longer to establish potable (适于饮用的)uses because of public nervousness about drinking wastewater, however treated.
|