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
31
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] 【C3】
选项
答案
survival
解析
(根据上下文可知,此处指“鸟类经常会迁移到数万英里远的温暖地区,在那里它们的存活几率最大”,根据给出的三个字母,可知该空应填survival(生存;幸存)。)
转载请注明原文地址:http://tihaiku.com/zcyy/3720362.html
相关试题推荐
FionathoughtthatMartin’stutorialtopicwasinterestingatfirst.A、TrueB、Fal
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
Althoughwetendtothinkthattheyarebasicallythesameanimal,dolphins,por
Althoughfewwoulddenythatit’sbettertoberichthanpoor,forsomepeop
Althoughfewwoulddenythatit’sbettertoberichthanpoor,forsomepeop
随机试题
Completethenotesbelow.Areasdealtwith:【L1】______northsub
【S1】[br]【S4】去掉anforexample是固定搭配,意为“例如”,中间不加冠词an。
Asmallsuccessatlastinmybattletoholdbackthetideofmiceflooding
膳食纤维属于( )。A.纤维素 B.非淀粉多糖 C.半纤维素 D.粗纤维
土的固结是指饱和土体在外荷载作用下,土体孔隙中水分逐渐排出,土体体积减小,密度增
基层群众性自治组织:是指我国依照宪法和法律有关规定,以城乡居民或村民一定居住地
从所给出的四个选项中,选择最合适的一项填入问号,使之呈现一定的规律性: A.如
冯某(25岁)涉嫌故意杀人罪,冯某委托律师陈某担任其辩护人。下列关于陈某的说法,
(2019年真题)某石化企业为增值税一般纳税人,主要业务为开采原油及石油炼制。该
内河航道炸礁工程,施工单位与业主签订合同后,办理了应办的各种手续,如期开工,施工
最新回复
(
0
)