5. Gasoline-powered boat engines manufactured in the a North American country prior to 1990 contribute significantly to the pollution found in the world’s oceans. In 1990, however, the government imposed stricter pollution controls on gasoline engines manufactured for boats, and beginning in 1995, the government imposed a program of inspections for pre-1990 boat engines with increasingly rigorous pollution standards. As the older boat engines fail to pass inspection, boat owners are increasingly retiring their old engines in favor of newer, less-polluting boat engines. As a result, [face=Times New Roman]the amount of pollution these older boat engines emit into the world’s oceans will steadily decrease over the next en years.[/face]
The two portions in boldface play which of the following roles?
(A) The first is a pattern of cause and effect that acts as an evidence in support of this argument; the second is the conclusion that can be drawn from this argument. (B) The first is a fact that acts as a principle in support of this argument; the second is the conclusion that must be drawn from this argument. (C) The first is a pattern of cause and effect that acts as an special evidence in support of the conclusion; the second is a general point that can be drawn from this argument. (D) The first is a pattern of cause and effect that acts as the third evidence in support of the argument; the second is a conclusion that must be true. (E) The first is a final evidence in support of the argument; the second is a conclusion that can be drawn only from the first.
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发表于 2003-9-5 12:22:00
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