Sadly，the abundance of passenger pigeons may have been their undoing.Where the birds were most abundant，people believed there was an ever­lasting 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 19th century，the hardwood forests where passenger pigeons nested had been damaged by Americans' need for wood，which scattered(驱散)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 10 years.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.

　　1．In the 18th and early 19th centuries，passenger pigeons ________.

　　A．were the biggest bird in the world

　　B．lived mainly in the south of America

　　C．did great harm to the natural environment

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