首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Birds are warm blooded animals. Though their feathers help to keep them warm, some birds such as ducks, 【C1】______(goose), and s
Birds are warm blooded animals. Though their feathers help to keep them warm, some birds such as ducks, 【C1】______(goose), and s
admin
2019-03-14
26
问题
Birds are warm blooded animals. Though their feathers help to keep them warm, some birds such as ducks, 【C1】______(goose), and swans still can’t endure harsh winter temperatures. For these reasons, birds from cold climates fly to warmer climates 【C2】______the winter. This seasonal movement of birds is called migration. Birds migrate to warmer places, often hundreds of miles away, where they can have the best chance of 【C3】sur______.
Birds migrate naturally. Certain clues from the environment cause hormone changes in the bird’s body. As the days get 【C4】______(short), for example, these hormones tell the bird’s body to store fat. This is because migrating takes an【C5】en______energy. Birds don’t have a lot of time to eat while migrating, so they rely on stores of fat.
When birds migrate, they fly as a group. To minimize the energy needed to fly long distances, a group of birds 【C6】______(fly)together in a V-shape. The bird at the front of the "V" uses the most energy because the wind often blows 【C7】______him. Every so often, the birds change positions so that each bird has a turn at the front, and everyone gets a rest.
【C8】Nav______is also an important part of the journey. Birds find where they are going by using visual clues, such as rivers, coastlines, and mountain ranges. In addition, they use the Sun and the star for guidance. 【C9】______(amaze), they also use the Earth’s invisible magnetic force for direction. This gives them a natural sense of north and south, like a kind of internal compass.
Many studies indicate that migratory birds fly along the same course every year. Researchers decide to test this using "bird banding". They first capture a migratory bird and attach a tag to its foot. This tag has an ID number on it, 【C10】______is stored in a database. They then set the bird free and track its movements. Bird banding has shown that many birds follow the same route year after year.
【C7】
选项
答案
against
解析
(根据语境可知,此处指“V形前的鸟耗费最大的体力,因为它是迎着风飞的”,against有“迎着;逆着”之意。)
转载请注明原文地址:https://kaotiyun.com/show/MuNK777K
本试题收录于:
C类竞赛(非英语专业本科)题库大学生英语竞赛(NECCS)分类
0
C类竞赛(非英语专业本科)
大学生英语竞赛(NECCS)
相关试题推荐
Turninyourcollectionofindustry-suppliedfreebiesandGoodmanwillsendbackafewreplacementpensbearingtheNoFreeLunc
Ifyou【D1】______smoothskinthatglowswithyouth,thechancesarethatatsomepointyouwillhaveheardtheexhortationtodri
SomechildrenlivinginEuropedon’thaveany______tolearnaforeignlanguage.Theyjustcannotseewhytheyshouldlearnit.
IntheUS,childrenmustgotoschoolfromtheageof6tobetweentheagesof14and16,______thestatetheylivein.
______thereislittlewecandotomodifytheweather,wecanatleastknowwhatkindofweathertoexpect.
ThegraphbelowshowsthenumberofTVwatchersinChina.Usingtheinformationfromthegraph,writeareportin80—100wordsd
Whichlampisthebrightest?LampAislessbrighterthanLampB:LampBisbrighterthanLampC:LampCisasbrightasLamp
TheCambridgeUnionSociety,commonly【C1】______(refer)tosimplyastheCambridgeUnion,isthelargeststudentsocietyatthe
TheMuseumofChildhoodThereare4,000toysinLondon’sMuseumofChildhood,butitisnotessentialtobeachildtoenjo
随机试题
材料:随着中考的临近,学生刘冰下定决心认真学习,争取在中考取得满意的成绩。在最初的学习中,刘冰明显感觉到自己的学习成绩进步迅速,然而经过一段时间废寝忘食地学习后,刘冰发现自己的进步速度减缓了,甚至出现成绩停滞不前的现象,而刘冰因为持续不断地学习,也
患者男性,46岁。近1个月频繁发作胸痛,持续数分钟,无症状时心电图正常。患者在进行平板运动试验检查时出现剧烈胸痛,立即终止试验,运动前、运动中及运动终止后的心电图见图4-4-5A、B、C。该患者终止运动试验的原因是
痿证与痹证的主要鉴别点是
由于供货方设计图纸错误以及因供货方技术服务人员的指导错误造成返工,供货方应承担因此所发生的()。
某商业企业为增值税一般纳税人,2013年3月采用分期收款方式批发商品,合同规定不含税销售额为300万元,本月收回50%的货款,其余货款于4月10日前收回。由于购货方资金紧张,本月实际收回不含税销售额100万元;零售商品实际取得销售收入228万元,其中包括以
产品成本预算的编制基础包括()。
机关对晋升领导职务的公务员应当在任职前或者任职后一年内进行任职培训。()
简述民主集中制原则在我国国家机构组织和活动中的体现。
在VB6.0的数据绑定控件中,用于连接外码对应的主码所在的主表数据源的属性是(3)。用于指定要绑定的数据源,并且值一般为ADO数据控件的名称的属性是(4)。3.
下列进程状态的转换下,不正确的一项是______。
最新回复
(
0
)