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28. in the second paragraph, the author implies that using radio transmitters would allow a researcher who studies crow to (a) identify individual crows (b) follow flocks of crows over long distances (c) record the times when crows are most active (d) help crows that BECome sick or injured 29. according to the third paragraph, which of the following is true about crows? (a) they seldom live in any one place for very long. (b) they thrive in a wide variety of environments. (c) they have marked preferences for certain kinds of foods. (d) they use up the resources in one area before moving to another. 30. in line 19,the word "inclinations" is closest in meaning to (a) tricks (b) opportunities (c) preferences (d) experiences 31. in lines 19-21, the author mentions a pet crow to illustrate which of the following? (a) the clever ways that crows solve problems (b) the differences between pet crows and wild crows (c) the ease with which crows can be tamed (d) the affection that crows show to other creatures 32. which of the following statements is supported by the passage? (a) crows have relatively long lives. (b) crows have keen vision (c) crows are usually solitary (d) crows are very intelligent. questions 33-41 in the early days of the united states, postal charges were paid by the recipient and charges varied with the distance carried. in 1825, the united states congress permitted local postmasters to give letters to mail carriers for home delivery, but these carriers received no government salary and their entire compensation depended on what they were paid by the recipients of individual letters. in 1847 the united states post Office department adopted the idea of a postage stamp, which of course simplified the payment for postal service but caused grumbling by those who did not like to prepay. besides, the stamp covered only delivery to the post office and did not include carrying it to a private address. in philadelphia, for example, with a population of 150,000, people still had to go to the post office to get their mail. the confusion and congestion of individual citizens looking for their letters was itself enough to discourage use of the mail. it is no wonder that, during the years of these cumbersome arrangements, private letter-carrying and express businesses developed. although their activities were only semilegal, they thrived, and actually advertised that between boston and philadelphia they were a half-day speedier than the government mail. the government postal service lost volume to private competition and was not able to handle efficiently even the business it had.  本文共2页: 第 1 [2] 页
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