題目題材：
交通運輸
題目：
The following appeared in a newspaper published in the state of Celera.
Speed limits on our states highways should be eliminated in order to increase our states prosperity. Because greater speed means more efficient travel, commercial deliveries will be faster, increasing business profits. Elimination of speed limits will also make driving more attractive to motorists, so that more people will use the highways, providing more highway toll revenues for the state. At the same time, safety on our highways will not be affected: daytime speed limits were eliminated last year in the western states of our country, and no significant increase in the number of accidents in these states has been reported.
提綱：
Elimination of speed limits does not necessarily guarantee greater speed.
The author fails to inform us how many travelers and commercial deliveries are using highways, thus we cannot evaluate to what extent the elimination of speed limit would increase our states prosperity.