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
职业资格
Plants and animals that have been studied carefully seem to have built-in clocks. These biological clocks, as they are called, u
Plants and animals that have been studied carefully seem to have built-in clocks. These biological clocks, as they are called, u
admin
2015-04-27
82
问题
Plants and animals that have been studied carefully seem to have built-in clocks. These biological clocks, as they are called, usually are not quite exact in measuring time. However, they work pretty well because they are "reset" each day, when the sun comes up.
Do pigeons use their biological clocks to help them find directions from the sun? We can keep pigeons in a room lit only by lamps. And we can program the lighting to produce artificial "days", different from the day outside. After a while we have shifted their clocks. Now we take them far away from home and let them go on a sunny day. Most of them start out as if they know just which way to go, but choose a wrong direction. They have picked a direction that would be correct for the position of the sun and the time of day according to their shifted clocks.
It is known and experimented that homing pigeons can tell directions by the sun. But what happens when the sky is darkly overcast by clouds and no one can see where the sun is? Then the pigeons still find their way home. The same experiment has been repeated many times on sunny days and the result was always the same. But on very overcast days clock-shifted pigeons are just as good as normal pigeons in starting out in the right directions. So it seems that pigeons also have some extra sense of direction to use when they cannot see the sun.
Naturally, people have wondered whether pigeons might have a built-in compass—something that would tell them about the directions of the earth’s magnetic field. One way to test that idea would be to see if a pigeon’s sense of direction can be fooled by a magnet attached to its back. With a strong magnet close by, a compass can no longer tell direction.
To test the idea, a group of ten pigeons had strong little magnet bars attached to their backs. Another group carried brass bars instead which were not magnetic. In a number of experiments, both groups were taken away from home and let go. On sunny days none of the magnet-pigeons was fooled. They were just as good as the brass-pigeons in starting out in the right direction toward home. On cloudy, overcast days, however, with no sun the brass-pigeons chose the right direction, but the magnet-pigeons were in trouble. They later started out in different directions and acted completely lost.
Which of the following can best describe the organization of the passage?
选项
A、Questions are raised first and then experiments to answer them are cited.
B、Opinions are given first and then evidences against them are quoted.
C、Statements come first and examples supporting them follow.
D、People’ s long held beliefs are cited first and exceptions come after.
答案
A
解析
文章中以“Do pigeons use their biological clocks to help them find directions from the sun?”提出问题,然后通过实验来解答问题。即采用了提出问题一解答问题的模式,因此A项正确。
转载请注明原文地址:https://kaotiyun.com/show/zcCv777K
本试题收录于:
英语学科知识与教学能力题库教师资格分类
0
英语学科知识与教学能力
教师资格
相关试题推荐
Whencheckingstudents’understandingofacertainlanguagepointinclass,whichoffollowingutterancesisateacherexpected
Todistinguishsounds,studentsareencouragedtopractice______.
MoveoverMethuselah.FuturegenerationscouldbelivingwellintotheirsecondcenturyandstilldoingSudoku,iflifeexpectan
MoveoverMethuselah.FuturegenerationscouldbelivingwellintotheirsecondcenturyandstilldoingSudoku,iflifeexpectan
Whichofthefollowingnominatingpatternscanateacheradopttoensurethatallstudentsareactivelyinvolvedinclassroomac
Sociolinguistsstudyvarietiesoflanguageand,accordingly,willbeinterestedintheanalysisofallofthefollowingEXCEPT__
Modernscientistsdividetheprocessofdyingintotwostages—clinicalortemporarydeathandbiologicaldeath.Clinicaldeatho
Ifthefunctionoflanguageislimitedtocommunication,thenanimals’callscanalsobecalledlanguage,butactuallytheyare
Thereisarealpossibilitythattheseanimalscouldbefrightened,______asuddenloudnoise.
Themethodofformingnewwordslike"smoke+fog→smog"and"breakfast+lunch→brunch"iscalled______.
随机试题
放射性核素检查的主要检查项目有放射性同位素_____和_____。
1947年知觉的“新观点”被提出,认为知觉不仅取决于客体本身,也取决于知觉者的
32岁,男性,因发热腰痛5d,无尿2d以流行性出血热诊断入院。入院后经利尿,纠正酸中毒等治疗末见好转,目前烦躁不安,眼睑水肿,体表静脉充盈,面部潮红,血压170/90mmHg、心率120/min,应诊断为
氰化物中毒病人洗胃时,应选用敌敌畏中毒病人洗胃时,应选用
银行对借款人进行财务评价的目的是分析借款人的()。
关于招聘计划,理解正确的是()。
林林因为迟到被老师赶出了教室。该教师的做法侵犯了林林的()。
甲因不服某区公安局行政处罚决定,向该区人民政府申请复议,但该区人民政府在法定期间内没有作出复议决定。甲以该区人民政府为被告向该区法院提起行政诉讼,下列说法正确的是()。
(2008年)曲线sin(xy)+ln(y一x)=x在点(0,1)处的切线方程是______________.
Whenone’sknowledgeandabilitiescannotmatchhisworkdemands,thestressmayhappen.
最新回复
(
0
)