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.

　　【语篇导读】　本文叙述了旅鸽逐渐消失的过程。

　　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

　　D．were the largest bird population in the US

　　解析　事实细节题。根据文章第一段所述在18和19世纪，美国大群的旅鸽飞起来可以遮住天空几个小时，所以美国旅鸽的数量是最大的，故选D。

　　答案　D

　　2．The underlined word“undoing”probably refers to the pigeons' ________.

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