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
54
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.
Hibernation is a seasonal practice. This means it ______.
选项
A、takes place only during a particular season
B、occurs only during the night
C、is a daily practice
D、only happens when a species becomes over-populated
答案
A
解析
第四段。科学家对冬眠这一现象所能肯定的唯一一条是它只在寒冷的季节发生。所以叫季节性睡眠。选项A是正确的。
转载请注明原文地址:https://kaotiyun.com/show/m5eC777K
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
GeorgeBernardShaw,thegreatestBritishdramatist(居作家)ofthefirsthalfofthe20thcentury,wasborninDublin,Ireland.Hi
GeorgeBernardShaw,thegreatestBritishdramatist(居作家)ofthefirsthalfofthe20thcentury,wasborninDublin,Ireland.Hi
Thesedaysmostpeople,especiallyyounggirls,liketolookslim.Ourgrandfather’s【21】weredifferent【22】ours,butnowadays【23】
Theyear2000willbringbigchangesincommunicationCellphoneswillbesmallenoughtocarryinyourpocket.Videophoneswill
Thetest______,webeganourholiday.
Itwasforthisreason______sheleftherhomelandandmovedtoamountainvillage.
Sportshavealwaysbeenruledbytheweather.Rain,sleet,snowandcoldcalledtheplays.Baseballfanshaveoftensatinther
Sincetheearly1980s,scientistshaverevealedsome40humangenesinvolvedincancer.Thesegenesareessentialfornormalgro
Youaskhowtostartabusiness?Hereisanexample.DavidDawson,aseriousmountainclimber,wasdissatisfiedwithsoftir
Wespendourleisurehoursefficientlyforhigherproduction,livebytheclockevenwhentimedoesnotmatter,modernizeourho
随机试题
求极限.
A、调理气血B、调整阴阳C、形神兼养D、劳逸结合E、三因制宜养生原则包括
慢性肾炎的主要病变部位是
既能息风止痉,又能祛风湿,止痹痛的药物是
我国《建筑法》规定,建筑工程开工之前,建设单位应当按照国家规定向( )人民政府建设行政主管部门申请领取施工许可证(限额以下的小型工程除外)。
公司与乙公司签订一个供货合同,约定由乙公司在一个月内向甲公司提供一级精铝锭100吨,价值130万元,双方约定如果乙公司不能按期供货的,每逾期一天须向甲公司支付总货款的0.1%作为违约金。由于组织货源的原因,乙公司在两个月后才向甲公司交付了100吨精铝锭,甲
一、注意事项 1.申论考试,与传统作文考试不同,是对分析驾驭材料的能力、解决问题能力、语言表达能力的测试。 2.作答参考时限:阅读材料40分钟,作答110分钟。 3.仔细阅读给定的材料,按照后面提出的“申论要求”依次作答。二、给定材料
A.Iliterallycan’tstop.B.ButnowIdon’tneedtoworryanymore.C.You’reknownasthefirstbillionaireauthorhere.D.B
请根据套利定价理论,分析套利组合应满足的基本条件。
矿山地租和建筑地段地租在内容上都包含
最新回复
(
0
)