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
2023-10-17
22
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/3105750.html
相关试题推荐
消防员没有多考虑个人的安危,像平常一样将困在大火中的人员援救出来。(thinklittleof)Thefirefightersthoughtlittl
虽然她在面试之前做了充分的准备,但还是没能回答出一些重要的问题。Althoughshehadbeenwellprepared.beforethei
Haveyoueverthoughtaboutinventingsomething?Didyouworrythatyouride
Haveyoueverthoughtaboutinventingsomething?Didyouworrythatyouride
Haveyoueverthoughtaboutinventingsomething?Wereyouworriedthatyour
Haveyoueverthoughtaboutinventingsomething?Wereyouworriedthatyour
Haveyoueverthoughtaboutinventingsomething?Wereyouworriedthatyour
Haveyoueverthoughtaboutinventingsomething?Wereyouworriedthatyour
Never______thatbrandofmake-upbecausetheytesttheirproductsonanimals.A、I
Joycereceivedthebillfromthecreditcardcompanyeventhoughshe_________ac
随机试题
Wemightbelivingforlongerthanever,butwearesick.About95percento
结构试验中任何一个测点的布置都应该是有目的的,应该服从于()的需要,不应盲目追求
男,16岁,口底左侧囊性肿物逐渐增大1个月余,检查如图。穿刺抽出约5mL粘稠、拉
前置胎盘时阴道出血的特征是A.无痛性阴道出血 B.阴道出血的发生常有明显的诱因
公司应当在每个会计年度上半年度结束之日起()个月内将半年度报告全文刊登在
基金经理下达1笔18元/股买入某只股票100万股,盘中交易员下达指令时,此股票的
橘红在贝母瓜蒌散中的主要用意是A.清热化痰 B.理气散结 C.理气化痰 D
根据下列资料回答问题。 2010年底,全国高速公路里程为7.41万公里,居世
在教学过程中,教师运用多媒体教育手段模拟实物的形象,为学生提供学习的感性材料,这
生产流程反映由原材料到产品的生产过程中,物料和能量的流向、变化以及所经历的设备、
最新回复
(
0
)