3．B　词义猜测题。根据画线单词所在句的句意及关键词语“20 percent”“10 percent”，并结合常识可知，该词意思是“归类，分类”。criticise “批评，指责”；group “分类，分组”；organise “组织”；name “命名”。

　　4．B　主旨大意题。通读全文内容可知，文章主要介绍了青少年中有一些人喜欢熬夜，不喜欢早起，这种睡眠模式被称为night owl，因此B项最能概括文章主旨。

　　Passage 6

　　(2017·课标全国卷Ⅰ)

　　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.

　　It was calculated that when its population reached its highest point，they were more than 3 billlion passenger pigeons—a number equal to 24 to 40 percent of the total bird population in the United States, making it perhaps the most abundant bird in the world. Even as late as 1870 when their numbers had already become smaller, a flock believed to be 1 mile wide and 320 miles (about 515 kilometers) 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 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.

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