2016高考英语二轮阅读理解一百六十集选练(110)
【由北京市丰台区2016高考模拟改编】
阅读下列短文,从每题所给的A、B、C、D四个选项中,选出最佳选项。
Have you ever looked toward the sky on a fall day and witnessed a group of migrating birds? If so, you probably noted the V-shaped formation of the birds or the birds flying in a ball-like formation. Why do birds fly this way? Many theories have been developed to explain the formation patterns of different types of birds.
One theory is that birds fly in certain formations to take advantage of the laws of nature. The birds know that flying in a V-shaped pattern will save energy. Like the lead cyclist in a race who decreases wind force for the cyclists who follow, the lead bird cuts wind force for the birds that follow. This decrease in wind force means that the birds use up to 70 percent less energy during their flight. When the lead bird becomes tired, a more rested bird takes over that position.
But saving energy is important for more than one reason. Sometimes food is short during migration flights. Keeping energy enables the birds to fly longer distances between meals.
When food is sighted, the birds guide one another in a different way. When a bird identifies a familiar feeding area, it might turn around in order to signal the group to change direction. Then, this bird becomes the new leader. It helps guarantee that other birds will know exactly where it is going. Then the whole group makes a change in direction, gently streaming from the sky down to the ground. This formation is like an arrow pointing to the location of food.
【2016届高考英语二轮复习阅读理解一百四十集选练:(110)】相关文章:
★ 贵州省贵阳市2014高考英语(新人教版)一轮阅读训练(24)附答案
★ 2014届高考英语一轮复习课时作业(四)必修1Module 4《A Social Survey—My Neighbourhood》(外研版)
★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (56)
★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (62)
★ 四川省2016届高考英语一轮复习课时作业(28) Module 4 Carnival 外研版必修5
★ 安徽省淮南市2014高考英语一轮单项选择及文章训练(7)及答案
★ 【北师大版】2014届高考英语一轮复习指导课时作业:Unit 4 A卷 Word版含解析
★ 2017届高考英语二轮复习书面表达限时测验:4(含解析)
★ 【三维设计】2017届高考英语(江苏专用)二轮复习高考单词5大记忆法课件:1.分类记忆法
最新
2017-04-24
2017-04-24
2017-04-24
2017-04-24
2017-04-21
2017-04-21