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½â´ð 51£®D£®Ï¸½ÚÀí½âÌ⣮¸ù¾ÝÎÄÕµÚÒ»¶Î"Passenger pigeons once flew over much of the United States in unbelievable numbers£®Written accounts from the 18th and 19th centuries described flocks£¨Èº£©so large that they darkened the sky for hours£®"¿ÉÖª£¬ÔÚÃÀ¹ú£¬18ÊÀ¼ÍºÍ19ÊÀ¼ÍÂøëµÄÊýÁ¿ºÜ´ó£®¹ÊÑ¡D£®
52£®B£®´ÊÒå²Â²âÌ⣮¸ù¾ÝÎÄÕÂ"Where the birds were abundant£¬people believed there was an ever-lasting supply and killed them by the thousands£®"¿ÉÖª£¬ÈËÃÇÈÏΪÂøëÊýÁ¿¶à»áÓÀºãµÄ¹©Ó¦£¬ÓÚÊdzÉǧµÄÈËɱº¦ÁËÂø룮Òò´Ë¿ÉÍƲâ´Ë´¦undoingµÄÒâ˼ÊÇËÀÍö£¬»ÙÃ𣮹ÊÑ¡B£®
53£®C£® ϸ½ÚÀí½âÌ⣮¸ù¾ÝÎÄÕµÚÈý¶Î"Commercial hunters attracted them to small clearings with grain£¬waited until pigeons had settled to feed£¬then threw large nets over them£¬taking hundreds at a time£®The birds were shipped to large cities and sold in restaurants£®"¿ÉÖª£¬ÉÌÒµÁÔÈ˲¶×½ÁË´óÁ¿µÄÂø룬°ÑËûÃÇÂôµ½´ó³ÇÊеIJ͹ÝÀÒò´ËÍƲâÈËÃÇɱËÀÂøëµÄÖ÷ÒªÔÒòÊÇΪÁË׬Ǯ£®Ñ¡ÏîAµÄÒâ˼ÊÇÑ°¿ªÐÄ£®ÎÄÖÐûÓÐÌáµ½ÈÃÈËÃǸßÐ˵ÄÄÚÈÝ£¬¹Ê²»·ûºÏÎÄÕµÄÒâ˼£®Ñ¡ÏîB£¬ÎªÁËÍì¾ÈÆäËûÄñÀ࣮ÔÚÎÄÖÐûÓÐÌáµ½ÆäËûÄñÀ࣬¹Ê²»·ûºÏÔÎÄ£¬¹ÊÅųýBÏѡÏîD£¬ÎªÁ˱£»¤×¯¼Ú£®¸ù¾Ýthe hardwood forests where passenger pigeons nested had been damaged by Americans'need for wood£¬which scattered£¨ÇýÉ¢£©the flocks and forced the birds to go farther north£¬¿ÉÖªÃÀ¹úÈËÊÇΪÁËÐèҪľ²Ä¶øÇý¸ÏÂø룬¶ø²»ÊÇΪÁ˱£»¤×¯¼Ú£¬¹ÊÅųýDÏ¹ÊÑ¡C£®
54£®B£®ÍÆÀíÅжÏÌ⣮¸ù¾ÝIÎÄÕÂ×îºóÒ»¶Î"n 1897£¬the state of Michigan passed a law prohibiting the killing of passenger pigeons£¬but by then£¬no sizable flocks had been seen in the state for 10 years£®"¿ÉÖª£¬µ½ÃÜЪ¸ùÖÝͨ¹ý½ûÖ¹ÍÀɱÂøëµÄ·¨ÂÉʱ£¬ÔÚÃÀ¹úÒѾ10ÄêûÓмû¹ý´óµÄÂøëȺ£¬Õâ¿ÉÍƶÏÂøëÊýÁ¿ÒѾºÜÉÙÁË£¬Òò´ËÕâÏî·¨ÂÉͨ¹ýµÃÌ«ÍíÁË£®¹ÊÑ¡B£®
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