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
35
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] What makes it necessary for a bird to rely on a magnetic compass when navigating?
选项
A、The possibility of bad weather.
B、The constant motion of the sun.
C、Its patterns of migration.
D、Its need to constantly change homes.
答案
A
解析
细节推理题。根据题干关键词makes it necessary,bird定位到原文首段尾句。原句中的cloudscover the sun与选项A对应。故答案为A。
转载请注明原文地址:http://tihaiku.com/zcyy/4037321.html
相关试题推荐
Inordertorepairbarns,buildfences,growcrops,andcareforanimalsafarme
Britishcancerresearchershavefoundthatchildhoodleukaemiaiscausedby
Britishcancerresearchershavefoundthatchildhoodleukaemiaiscausedby
Ofthegreatvarietyofopinionsconcerning"marriageformoney",thefollowin
49TheendofwinteristhemostdangeroustimefortheanimalsinYellowstoneP
Potentiallyofferingapowerfulnewtoolagainstterrorism,researchershave
Potentiallyofferingapowerfulnewtoolagainstterrorism,researchershave
Potentiallyofferingapowerfulnewtoolagainstterrorism,researchershave
Someresearchersfeelthatcertainpeoplehavenervoussystemsparticularly_____
Therangeandvarietyofgovernmentactionthatis,atleastinprinciple,r
随机试题
【B1】[br]【B6】A、whatB、howC、whereAabout是介词,后面要用名次或动名词作宾语,而whattodo是一个名词结构,wh
[originaltext]W:Dr.Carter’sOffice.M:Yes,I’dliketomakeanappointmentt
TheenormouslossoflifeontheTitanicwasprimarilycausedbyinadequateequi
平衡水池应设与游泳池相连接的连通管,连通管可与回水管合并设置,平衡水池底内表面宜
有一天,甲、乙、丙、丁、戊五个外国商人坐在一起聊天。甲说:“我们五个人中有一个人
患者男,30岁。右髋部撞击伤后疼痛,活动不能2小时。查体:患肢呈外展、外旋和屈曲
绿色营销以()为物质保证。A:绿色观念 B:绿色消费 C:绿色法制 D:绿
患者男性,30岁,确诊哮喘入院治疗3周,经正规治疗病情缓解,仅偶有胸闷,出院时医
在下列医德情感的描述中,错误的是A.医德情感是建立在医学科学基础上的急患者所急、
在物业管理活动中,业主享有的权利包括()。A、提议召开业主大会会议 B、执行业
最新回复
(
0
)