首页
登录
职称英语
Birds are warm blooded animals. Though their feathers help to keep them warm
Birds are warm blooded animals. Though their feathers help to keep them warm
游客
2024-08-15
6
管理
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. [br] 【C5】
选项
答案
enormous
解析
(根据下一句描述的“迁徙过程中,鸟类没有太多时间进食,因此不得不依靠所存储的脂肪”,可推测该句指“鸟类身体储存脂肪是因为迁徙要耗费很大精力”。enormous巨大的,极大的,很多的。)
转载请注明原文地址:https://tihaiku.com/zcyy/3720364.html
相关试题推荐
FionathoughtthatMartin’stutorialtopicwasinterestingatfirst.A、TrueB、Fal
Althoughonemightnotthinksofromsomeofthecriticismofit,advertisin
Althoughonemightnotthinksofromsomeofthecriticismofit,advertisin
Althoughonemightnotthinksofromsomeofthecriticismofit,advertisin
虽然对如何治理国家,两位政治候选人会有不同的想法,但他们在竞选中所花的钱常常一样多。Althoughthetwopoliticalcandidates
IntheUnitedStatesalsothereweregreatchanges,thoughthecausesherew
IntheUnitedStatesalsothereweregreatchanges,thoughthecausesherew
IntheUnitedStatesalsothereweregreatchanges,thoughthecausesherew
Althoughfewwoulddenythatit’sbettertoberichthanpoor,forsomepeop
Althoughfewwoulddenythatit’sbettertoberichthanpoor,forsomepeop
随机试题
Computerswilldevelopmoresuccessfullybecausetheyenableustofulfilltasks
HowmanysquarekilometersdoesIBM’sGlobalHigh-ResolutionAtmosphericForecas
小学体育《跨越式跳高》 一、考题回顾
在企业实践中,滚动预算的实施频度通常设定为按月为周期实施。()
按龙骨吊顶的施工顺序为:()。A.弹线找平→安装吊杆→安装主龙骨→安装次龙骨及
沥青混合料面层主控项目:原材料、压实度、面层厚度、()。A、弯沉值 B、宽度
A.PCTB.MPVC.RETD.MCHCE.MONO%与血细胞分析仪各检测项目
“唯上智与下愚难移”说明( )A.遗传决定论 B.环境决定论 C.先天决定
甲公司想要买入一个设备,为以后扩展企业规模做准备,该设备有三种支付方式: 第一
根据企业国有资产法律制度的规定,国有股东发行的可交换公司债券交换为上市公司每股股
最新回复
(
0
)