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
Animals have different ways of protecting themselves against wintertime weather. Some animals grow heavy coats of fur or feather
Animals have different ways of protecting themselves against wintertime weather. Some animals grow heavy coats of fur or feather
admin
2012-12-31
30
问题
Animals have different ways of protecting themselves against wintertime weather. Some animals grow heavy coats of fur or feathers, while others dig into the ground to find a warm wintertime home.
Some animals spend the winter in a deep sleep because by going to sleep they avoid the time of the year when food is scarce and the temperatures are low. Their sleep is known as hibernation.
There is much about hibernation that puzzles scientists. For example, they are wondering how hibernation came into being. Some scientists have explored the possibility that animals release a chemical that starts them hibernating.
One thing that scientists are certain about is that animals hibernate only when it is cold. Hibernation is a seasonal practice.
Some animals that fall into a wintertime sleep are not true hibernators because they spend only a part of the cold season asleep. Bears, for example, can easily be awakened from their winter nap. They are not true hibernators.
Sometimes it is difficult to determine whether a particular animal is a true hibernator. For example, some mice hibernate, but others do not. The same is true of bats. Some of them hibernate. Others do not.
Some scientists believe that hibernation is started by ______.
选项
A、over-eating
B、calcium deposits
C、a body chemical
D、a lack of water
答案
C
解析
第三段。这段说有的科学家做了这方面的研究,认为冬眠很可能因为动物自身释放的化学物质所导致的。选项C是正确的。
转载请注明原文地址:https://jikaoti.com/ti/qcuGFFFM
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
TheEnglishlanguageweknowtodayisaboutsixhundredyearsold.Forhalfthattime,Englishwasjustthelanguageofthepeop
Booksareforreading,butmanmustbringtotheirreadingadesiretolearnandapowerofabsorbing.Readingshouldbeactive,
Isthistheknife______?
Pickouttheappropriateexpressionsfromtheeightchoicesbelowandcompletethefollowingdialoguebyblackeningthecorrespo
In1807NoahWebsterbeganhisgreatestwork,AnAmericanDictionaryoftheEnglishLanguage.Inpreparingthework,hedevoted
Americaisacountryonthemove.Inunheardofnumbers,peopleofallagesareexercisingtheirwaytobetterhealth.According
Shoesareoutercoveringsforthefoot.Theyhavesoles,andmosthaveheels.Theupperpartofmostshoesextendnohigherthan
Theforeignersonce______theirproductstoourcompanyata______higherprice.
Animalshavedifferentwaysofprotectingthemselvesagainstwintertimeweather.Someanimalsgrowheavycoatsoffurorfeather
Suchasmallmancan’t_____reachtheballoononemetrehigherthanhe.
随机试题
接触式密封包括哪几种?
尿酮体是指
实验动物新生期切除胸腺后,淋巴结内
病理性双侧瞳孔缩小,可见于()
下列实验检查中,最能反映贫血程度的是
基金资产估值引起的资产价值变动作为公允价值变动损益记人当期损益。()
经常预算的收入来源主要是( )。
()评估是鉴定招聘效率的一个重要指标。
弗洛伊德认为人格的构成是()。
TheInquiryLetterGentlemen:Wesawyourwomen’sdressesandsuitsattheLondonfashionshowheldinNewYorkonOctober
最新回复
(
0
)