A. communicate more with the public.

　　B. employ hi-tech means in research.

　　C. feel no shame for their cause.

　　D. strive to develop new cures.

　　50. From the text we learn that Stephen Cooper is

　　A. a well-known humanist.

　　B. a medical practitioner.

　　C. an enthusiast in animal rights.

　　D. a supporter of animal research.

　　ABBAD

　　Text 3

　　In recent years, railroads have been combining with each other, mergingsintossuper systems, causing heightened concerns about monopoly. As recently as 1995, the top four railroads accounted for under 70 percent of the total ton-miles moved by rails. Next year, after a series of mergers is completed, just four railroads will control well over 90 percent of all the freight moved by major rail carriers.

　　Supporters of the new super systems argue that these mergers will allow for substantial cost reductions and better coordinated service. Any threat of monopoly, they argue, is removed by fierce competition from trucks. But many shippers complain that for heavy bulk commodities traveling long distances, such as coal, chemicals, and grain, trucking is too costly and the railroads therefore have them by the throat.

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