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請教各位: 24 Tiger beetles are such fast runners that they can capture virtually any nonflying insect. However,when running toward an insect, the beetles intermittently stop, and then, a moment later, resume their attack. Perhaps they cannot maintain their pace and must pause for a moment's rest; but an alternative hypothesis is that while running tiger beetles are unable to process the resulting rapidly changing visual information, and so quickly go blind and stop. Which of the following, if discovered in experiments using artificially moved prey insects, would support one of the two hypotheses and undermine the other? a when a prey insect is moved directly toward a beetle that has been chasing it, the beetle immediately truns and runs qway without its usual intermittent stopping. b. In pursuing a moving insect, the beetles usually responjd immediately to changes in the insect's direction, and paruse equallly frequently whether the chase is up or down an incline. c. The beetles maintain a fixed time interval between pauses, although when an insect that jad been stationary begins to flee. the beetle increases its speed after its next pause. d. If , when a beetle pauses, it has not gained on the insect it is pursuing, the beetle generally ends its pursuit. e. when an obstacle is suddenly introduced just in front of running beetles, the beetles sommetimes stop immediately, but they never respond by running around the barrier. ans:c, I choose b. 我覺得c兩個假設都否定ㄟ。 36. Outsourcing is the practice of obtaining from an independent supplier a product or service that a company has reviously provided for itself. Vernon, Inc., a small manufacturing company that has in recent years experienced a decline in its profits, plans to boost its profits by outsourcing those parts of its business that independent suppliers can provide at lower cost than Vernon can itself. Which of the following, if true, most strongly supports the prediction that Vernon's plan will achieve its goal? a. Among the parts of its business that Vernon does not plan to outsource are some that require standards of accuracy too high for most independent suppliers to provide at lower cost than Vernon can. b. Vernon itself acts as an independent supplier of specialized hardware items to certain manufacturers that formerly made those items themselves. c. Relatively few manufacturers that start as independent suppliers have been able to expand their business and become direct competitors of the companies they once supplied. d. Vernon plans to select the independent suppliers it will use on the basis of submitted bids. e Attending to certain tasks that Vernon performs relatively indfficiently has taken up much of the time and effort of top managers whose time would have been better spent attending to Vernon's core business. Ans.e . I choose a | 
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发表于 2008-2-16 04:11:00
