试题查看

首页 > 公共英语考试 > 试题查看
【单选题】

Large animals living in the desert have developed 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 animals also depart from other animals’ normal practice of maintaining a constant body temperature. Instead of trying to keep down the body temperature deep inside the body, which would involve the loss of water and energy, large desert animals allow their temperatures to rise to what would normally be fever height, and temperatures as high as 46 degreesCelsius have been measured in grant’s gazelles. The over-heated body then cools down during the cold desert night, and indeed the temperature may fall unusually low by dawn, as low as 34 degreesCelsius 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% of its body weight as water without harm to itself, whereas human beings die after losing only 12%-13% of their body weight.An equally important adaptation is the ability to recover this water loss at one drink.Desert animals can drink massive volumes of water in a short time, and camels have been known to drink over 100 liters in a few minutes.A、person who severely loses water, on the other hand, cannot drink enough water for recovery at one session, because the human stomach is not sufficiently big and because a too rapid mixing of the body liquid with water 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 by searching quite a few distant places.Desert-adapted animals have the further ability to feed normally when extremely thirsty: it is a common experience in people that appetite is lost even under conditions of moderate thirst.
The word "maintaining" in line 3 of the first paragraph is closest in meaning to ______.A.reducing
B.preserving
C.avoiding
D.measuring
查看答案解析

参考答案:

正在加载...

答案解析

正在加载...

如答案有误或试题有侵权,请联系我们。[提交反馈][在线客服]

根据网考网移动考试中心的统计,该试题:

37%的考友选择了A选项

52%的考友选择了B选项

2%的考友选择了C选项

9%的考友选择了D选项

你可能感兴趣的试题

AnincreaseinfreeparksinShanghaimightbeplSomesurveysshowthatalotofpeoplebelievethQuestions22-25arebasedonthefollowingpassQuestions18-21arebasedonthefollowingdialQuestions14-17arebasedonthefollowingdialTextThereisnodenyingthatstudentsshouldle
版权所有网考网(netkao.com)All Rights Reserved

警告:系统检测到您的账号存在安全风险

抱歉,您的账号因涉嫌违反网考网购买须知被冻结。您可在“网考网” 微信公众号中的“官网服务”- "账号解封申请”申请解封。

微信扫描关注网考网