本文是一篇记叙文。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 U．S.

　　答案　D

　　解析　根据Passenger pigeons(旅鸽) once flew over much of the United States in unbelievable numbers. Written accounts from the 18th and 19th centuries described flocks(群)so large that they darkened the sky for hours.可知选D。

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

　　.

　　A. escape B.ruin

　　C. liberation D.evolution

　　答案　B

　　解析　根据Where the birds were most abundant, people believed there was an ever lasting supply and killed them by the thousands.可知选B。

　　3．What was the main reason for people to kill passenger pigeons?

　　A. To seek pleasure. B.To save other birds.

　　C. To make money. D.To protect crops.

　　答案　C

　　解析　根据Commercial hunters attracted them to small clearings with grain, wait 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.可知选C。

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