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
A、Salmon and tunas. B、Locusts and butterflies. C、Ants and bees. D、Whales and bats. B
A、Salmon and tunas. B、Locusts and butterflies. C、Ants and bees. D、Whales and bats. B
admin
2013-04-15
30
问题
One of the greatest mysteries of nature is the instinct to migrate. Every year, millions of creatures feel the need to migrate and most people have seen the arrival or departure of migrating flocks of birds. In England, for example, we always know when Autumn is coming, because flocks of swallows sit on the telegraph wires. Migration is not only seen in birds but also in reptiles, for example, turtles, frogs and toads. Insects, such as locusts and butterflies; fish, such as eel, salmon and tunas and mammals, such as reindeer, seals, lemmings, whales and bats. Many of these creatures can find their way over long distances. And how they do it is a mystery and a wonder to everyone, especially for those of us who have difficulty even reading a map covering 100 miles. There are several suggestions about how they navigate. Firstly, it is suggested, they navigate by using stars and planets for guidance. Secondly, some people think that these migrating mammals find their way by following the pole of the earth’s magnetic field. Thirdly some people think that migrating birds, insects and animals follow a certain smell or scent. Fourthly, another group of people believe that animals migrate by recognizing geographical features. Fifthly, some people think that animals migrate by following changes in temperature. And finally, there are people who suppose they migrate by following sound.
选项
A、Salmon and tunas.
B、Locusts and butterflies.
C、Ants and bees.
D、Whales and bats.
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/vOI7777K
0
大学英语六级
相关试题推荐
A、Theimpactofcommercialwhaling.B、WhyJapanandNorwaycontinuetohuntwhales.C、TheinactionoftheIWC.D、Theimmorality
A、Shewasveryluckytoseemanywhales.B、Shedidn’tgotothewhale-watchingtrip.C、Shedidn’tseeawhaleonherwhale-watch
随机试题
Passengersshouldallowfor______traveltimetotheairportinrushhourtraffic.
患者,男,72岁。因胃癌晚期,不能进食,需经静脉供给高营养以维持生命,采用颈外静脉穿刺法输液,其穿刺部位为下颌角与锁骨上缘中点连线的()。
按照以证据为基础的信息质量评价标准,美国药典信息开发部从1996年起对药物适应证或禁忌证的信息开始注明其循证医学证据等级,其中的E类证据是
发生意外穿髓后首选的处理方法是
到期收益率的暗含条件有()。
下列各项关于现金周转期的表述中,正确的有()。
()被誉为“科学教育学之父”。他强调“教师为中心、教材为中心、课堂为中心”,被称为传统教育学的代表。
对二叉树的结点从1开始进行连续编号,要求每个结点的编号大于其左、右孩子的编号,同一结点的左右孩子中,其左孩子的编号小于其右孩子的编号,为实现编号可采用的遍历是()。
设z=f(x,y)在点(1,1)处可微,f(1,1)=1,f1’(1,1)=a,f2’(1,1)=b,又μf[x,f(x,x)],求|x=1.
ReadthetextbelowandanswerQuestions8-13.RightsintheworkplaceThisleafletexplainsyourlegal
最新回复
(
0
)