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
专升本
Humans have long been studying the flight of birds and trying to imitate it. Not until the twentieth century did engineers fully
Humans have long been studying the flight of birds and trying to imitate it. Not until the twentieth century did engineers fully
admin
2021-11-11
43
问题
Humans have long been studying the flight of birds and trying to imitate it. Not until the twentieth century did engineers fully understand the principles of flight that birds have been using for millions of years.
Birds are adapted in their body structure, as no other creatures, to life in the air. Their wing, tails, hollow bones, and internal air sacs(气囊) all contribute to this great faculty. These adaptations make it possible for birds to seek out environments most favorable to their needs at different times of the year. This results in the marvelous phenomenon we know as migration—the regular, seasonal movement of entire populations of birds from one geographic location to another.
Each year with great regularity most species of birds return to their summer homes, court(求偶 ) and choose mates, build their nests, lay eggs, and rear their young. In the late summer and fall they acquire their new plumage(羽毛). Then they join with others of their kind in large and small flocks, feeding and storing up fat in their bodies. Thus they prepare for the hardships of winter, whether they remain in the cold northlands or make the strenuous (艰苦的) journey to the south.
We can know from the passage that______.
选项
A、birds are built the same as other creatures
B、birds are built to fly
C、birds need to migrate to survive
D、birds need to be told when to migrate
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/xkRC777K
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
Ihavegivenuptryingtoconvincehim:thereisnopoint______arguingwithhim.
Lifeisnotpredictable:eventheworst______becomethebest.
Allflights______becauseofthesnowstorm,manypassengerscoulddonothingbutstayattheairport.
WhenIwasstudyingEnglishatatrainingcenterinWashingtonD.C.in1998,IsharedahousewithtwoyoungAmericans,Jimand
Topreservefood,thegrowthofbacteria(细菌)mustbecontrolled.Water,warmth,andfoodareallneededforbacteriatobecomest
Thereisadifferencebetweenscienceandtechnology.Scienceisamethodofansweringtheoreticalquestions;technologyisame
CarsareanimportantpartoflifeintheUnitedStates.Withoutacar,mostpeoplefeelthattheyarepoor.Anevenifaperson
CarsareanimportantpartoflifeintheUnitedStates.Withoutacar,mostpeoplefeelthattheyarepoor.Anevenifaperson
随机试题
A.自由度B.样本含量C.理论频数D.行×列表中格子数的多少E.实际频数抽样误差的大小受到什么影响
患者,女,20岁,一年前被同学辱骂后,逐渐出现性格改变,对家人亲友变得冷淡,对所有的事情都不感兴趣,有时莫名其妙地哭泣,不去上学,不作家务,不梳洗打扮,对与自己有关的各种事情表现得无动于衷,最可能的诊断
估计排卵日期,哪种检查方法最简便()
佣金可分为明佣和暗佣。
入境后,需要进行隔离检疫的,还要向出入境检验检疫机关申请( )。带介质土的还需办理特许审批。
矩阵组织结构适应的企业类型是()。
根据《行政复议法》的规定,下列情形中,不属于行政复议范围的是()。
从教学实际过程看,学生学习知识的过程可分为知识的理解、________和________三个彼此相互联系又相对独立的阶段。
热:蒸发
农产品补贴通常是指一国政府对本国的农业产品生产商或者经营者提供资金或财政上的支持,包括现金补贴、价格支持或其他政策优惠待遇,使其农业产品在国际、国内市场上与未受补贴的同类产品相比获得竞争优势。根据上述定义,下列属于农产品补贴的是:
最新回复
(
0
)