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From 1983 to 1993, millions of gallons of liquid waste from commercial manufacturing plants were dumped into inland waterways. There is increasing apprehension that the liquid waste will leak contaminants into local water supplies. That apprehension is unwarranted, as tests of the local water supplies of regions near commercial manufacturers who practiced such dumping during the 1960s showed little or no evidence of such contaminants.
Which of the following, if true, most seriously undermines the argument above?
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A.Commercial manufacturing plants in the 1960s leaked significantly fewer gallons of liquid waste into local water supplies than did plants from 1983 to 1993.
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B.In the 1960s, liquid waste dumped by commercial manufacturing plants contained a greater concentration of harmful agents.
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C.In the 1960s, solid waste pollution of inland waterways constituted a greater hazard to local water supplies than did liquid waste during the period from 1983 to 1993.
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D.In recent years, environmentalists have made serious attempts to curb liquid waste pollution by commercial manufacturers.
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E.During the period from 1983 to 1993, commercial manufacturing plants were less likely to dump liquid waste than were plants during the 1960s.
A显示答案
