Question

7£®Passenger pigeons once flew over much of the United States in unbelievable numbers£®Written accounts from the 18^th and 19^th centuries described flocks£¨Èº£© so large that they darkened the sky for hours£®
It was calculated that when its population reached its highest point£¬there were more than 3billion passenger pigeons-a number equal to 24to 40percent of the total bird population in the United States£¬making it perhaps the most abundant bird in the world£®Even as late as 1870when their numbers had already become smaller£¬a flock believed to be a mile wide and 320miles £¨about 515kilometers£© long was seen near Cincinnati£®
Sadly£¬the abundance of passenger pigeons may have been their undoing£®Where the birds were most abundant£¬people believed there was an ever-lasting supply and killed them by the thousands£®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£®
By the closing decades of the 19^th century£¬the 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£¬where cold temperatures and spring storms contributed to their decline£®Soon the great flocks were gone£¬never to be seen again£®
In 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 10years£®The last confirmed wild pigeon in the United States was shot by a boy in Pike County£¬Ohio£¬in 1900£®For a time£¬a few birds survived under human care£®The last of them£¬known affectionately as Martha£¬died at the Cincinnati Zoological Garden on September 1£¬1914£®
24£®In the 18^th and early 19^th centuries£¬passenger pigeonsD£®
A£®were the biggest bird in the world             
B£®lived mainly in the south of America
C£®did great harm to the natural environment       
D£®were the largest bird population in the US
25£®The underlined word"undoing"probably refers to the pigeons'B£®
A£®escape              
B£®ruin
C£®liberation            
D£®evolution
26£®What was the main reason for people to kill passenger pigeons£¿C
A£®To seek pleasure£®
B£®To save other birds£®
C£®To make money£®
D£®To protect crops£®
27£®What can we infer about the law passed in Michigan£¿B
A£®It was ignored by the public£®
B£®It was declared too late£®
C£®It was unfair£®
D£®It was strict£®

Answer 1

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26£®C ϸ½ÚÀí½âÌ⣮ÈËÃÇɱËÀÂøëµÄÖ÷ÒªÔ­ÒòÊÇʲô£¿¸ù¾ÝCommercial 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£®¿ÉÖªÉÌÒµÁÔÈ˲¶×½ÁË´óÁ¿µÄÂø룬°ÑËûÃÇÂôµ½´ó³ÇÊеIJ͹ÝÀÒò´ËÍƲâÈËÃÇɱËÀÂøëµÄÖ÷ÒªÔ­ÒòÊÇΪÁË׬Ǯ£®¹ÊÑ¡C£®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
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