首页
登录
职称英语
Researchers have found that migrating animals use a variety of inner compass
Researchers have found that migrating animals use a variety of inner compass
游客
2025-04-14
48
管理
问题
Researchers have found that migrating animals use a variety of inner compasses to help them navigate. Some direct themselves by the position of the sun. Others navigate by the stars. Some use the sun as their guide during the day, and then switch to star navigation by night. One study shows that the homing pigeon uses the Earth’s magnetic fields as a guide in finding its way home, and there are indications that various other animals, from insects to mollusks, can also make use of magnetic compasses. It is of course very useful for a migrating bird to be able to switch to a magnetic compass when clouds cover the sun; otherwise it would just have to land and wait for the sun to come out again. Even with the sun or stars to guide by, the problems of navigation are more complicated than they might seem at first. For example, a worker honeybee that has found a rich source of nectar and pollen flies rapidly home to report. A scientist has discovered that the bee sent out to look for food delivers her report through a complicated dance to the other workers not only how far away the food is, but also what direction to fly in relation to the sun. But the sun does not stay in one place all day. As the workers start out to gather the food, the sun may already have changed its position in the sky somewhat. In later trips during the day, the sun will seem to move farther and farther toward the west. Yet the worker bees seem to have no trouble at all in finding the food source. Their inner clocks tell them just where the sun will be, and they change their course correspondingly. [br] The author mentions all the following natural phenomena that help animals navigate EXCEPT
选项
A、the sun
B、the stars
C、magnetic fields
D、wind direction
答案
D
解析
细节事实题。根据题干关键词help animals navigate定位到原文首段。原文首段的第二、三、五句分别提到了the sun,the stars,magnetic fields。故答案为D。
转载请注明原文地址:http://tihaiku.com/zcyy/4037320.html
相关试题推荐
Thecomputercanbeprogrammedto______awholevarietyoftasks.A、assignB、tackl
Britishcancerresearchershavefoundthatchildhoodleukaemiaiscausedby
Britishcancerresearchershavefoundthatchildhoodleukaemiaiscausedby
Britishcancerresearchershavefoundthatchildhoodleukaemiaiscausedby
Britishcancerresearchershavefoundthatchildhoodleukaemiaiscausedby
Ofthegreatvarietyofopinionsconcerning"marriageformoney",thefollowin
Ofthegreatvarietyofopinionsconcerning"marriageformoney",thefollowin
Potentiallyofferingapowerfulnewtoolagainstterrorism,researchershave
Potentiallyofferingapowerfulnewtoolagainstterrorism,researchershave
Therangeandvarietyofgovernmentactionthatis,atleastinprinciple,r
随机试题
12thJune
Thecommitteemembersproposethattheplan______.postponedforafewdays.A、t
Welcometo2008ChinaDailyNewspaperGroupSubscription(订阅)andConsult
A—jointaccountB—depositaccountC—irrevocablecreditD—currentaccountsE—open
创建一个400mm宽度的矩形风管,分别添加30mm的隔热层和内衬,那么在平面图中
当代发达国家的旅行社业的发展特征( )。A.适应旅游需求变化,不断更新营销战略
刘大爷因脑梗后遗症行动不便,日常起居由老伴照料。前不久,老伴去世,刘大爷独自一人
根据上述症状选出血淋的主症A.小便点滴短少 B.小便混浊如米泔水 C.小便时
下列选项不属于银行机构市场准入的是( )。A.机构准入 B.第三方准入 C
属于社会因素中影响人类生活和行为的是( )。A.收入分配B.资源综合开发C.能源
最新回复
(
0
)