首页
登录
职称英语
Large animals that inhabit the desert have evolved a number of adaptations f
Large animals that inhabit the desert have evolved a number of adaptations f
游客
2024-06-06
12
管理
问题
Large animals that inhabit the desert have evolved a number of adaptations for reducing the effects of extreme heat. One adaptation is to be light in color, and to reflect rather than absorb the Sun’s rays. Desert mammals also depart from the normal mammalian practice of maintaining a constant body temperature. Instead of trying to keep down the body temperature deep inside the body, which would involve the expenditure of water and energy, desert mammals allow their temperatures to rise to what would normally be fever height, and temperatures as high as 46 degrees Celsius have been measured in Grant’s gazelles. The overheated body then cools down during the cold desert night, and indeed the temperature may fall unusually low by dawn, as low as 34 degrees Celsius in the camel. This is an advantage since the heat of the first few hours of daylight is absorbed in warming up the body, and an excessive buildup of heat does not begin until well into the day.
Another strategy of large desert animals is to tolerate the loss of body water to a point that would be fatal for non-adapted animals. The camel can lose up to 30 percent of its body weight as water without harm to itself, whereas human beings die after losing only 12 to 13 percent of their body weight. An equally important adaptation is the ability to replenish (Sheik) this water loss at one drink. Desert animals can drink huge volumes in a short time, and camels have been known to imbibe (吸收) over 100 liters in a few minutes. A very dehydrated person, on the other hand, cannot drink enough water to rehydrate at one session, because the human stomach is not sufficiently big and because a too rapid dilution of the body fluids causes death from water intoxication. The tolerance of water loss is of obvious advantage in the desert, as animals do not have to remain near a water hole but can obtain food from grazing sparse pastures. Desert-adapted mammals have the further ability to feed normally when extremely dehydrated, it is a common experience in people that appetite is lost even under conditions of moderate thirst. [br] What does the author imply about desert-adapted mammals?
选项
A、They do not need to eat much food.
B、They can eat large quantities quickly.
C、They easily lose their appetites.
D、They can travel long distances looking for food.
答案
D
解析
本题是有关适应沙漠生活的动物的问题,因此要在第一段和第二段两段中找到答案,其中A说的是他们没有吃足够的事物,在文章中没有提到,因此是错误的。而同样的道理,B讲的是沙漠的动物要吃大量的事物,在文中也没有提到,因此也是错误的。最后一段最后一句的前半句“Desert-adapted mammals have the further ability to feed normally when extremely dehydrated.”说的是适应沙漠生活的哺乳动物可以在脱水的情况下正常进食,与C说的失去胃口相悖,因此C是错误的。而D讲的是它们可以旅行很长的距离去寻找食物,在文章第二段倒数第二句讲过“animals do not have to remain near a water hole but can obtain food from grazing sparse pastures”动物不必呆在离水很近的地方,就象它们可以去广袤的草原去寻找事物,这耕暗示着食物离它们很远,因此D是符合题意的。
转载请注明原文地址:https://tihaiku.com/zcyy/3622365.html
相关试题推荐
Largeanimalsthatinhabitthedeserthaveevolvedanumberofadaptationsf
Anumberoffactorsrelatedtothevoicerevealthepersonalityofthespeak
Anumberoffactorsrelatedtothevoicerevealthepersonalityofthespeak
[originaltext]Chinesecharacters.evolvedfrompicturesandsigns,andthe
BasicEnglishisEnglishmadesimplebylimitingthenumberofitswordsto
BasicEnglishisEnglishmadesimplebylimitingthenumberofitswordsto
BasicEnglishisEnglishmadesimplebylimitingthenumberofitswordsto
BasicEnglishisEnglishmadesimplebylimitingthenumberofitswordsto
BasicEnglishisEnglishmadesimplebylimitingthenumberofitswordsto
[originaltext]Beesareverysmallanimalswhichflythroughtheairtolook
随机试题
Whyyoushouldn’ttrytobeamorningpersonA)We’veallhear
危险性较大的分部分项工程是指建筑工程在施工过程中存在的、可能导致作业人员群死群伤
标准贯入试验成果的应用范围有:()A.确定砂土的密实度 B.确定砂土的内摩擦
药物及其代谢产物主要从()排泄。A.胆汁 B.汗液 C.尿液 D.乳汁
按照关联交易的性质划分,关联交易一般可分为( )。 Ⅰ.进出口贸易中的关联交
有甲乙丙丁四个互斥方案,投资额分别为1000万元、800万元、700万元、600
(2021年1月真题)当期货市场出现异常情况时,期货交易所可以按照其章程规定的权
A.益智仁 B.海马 C.杜仲 D.肉苁蓉 E.沙苑子既能补肾阳,又能活
关于人工挖孔桩施工要求的说法,正确的有()。A.孔口处护圈应与地面齐平 B.
下述何项不是胎儿缺氧的表现A、晚期减速 B、胎动记数<6次/2小时 C、mA
最新回复
(
0
)