OG43

OG43
我刚看完这篇文章，讲动物如何通过身体机能适应缺水环境的。不知道是什么问题，我在下载区DOWN的文章只有两段话，分别讲兔子和海生脊椎动物的，根本就没有提骆驼，可题目有3题是和骆驼有关，到底是什么原因？

有谁帮贴一下, 到2772中好难找

http://forum.chasedream.com/dispbbs.asp?boardID=25&ID=41429&page=1

Passage 112 (12/17)

Homeostasis, an animal’s maintenance of certain internal variables within an acceptable range, particularly in extreme physical environments, has long interested biologists. The desert rat and the camel in the most water-deprived environments, and marine vertebrates in an all-water environment, encounter the same regulatory problem: maintaining adequate internal fluid balance.

For desert rats and camels, the problem is conservation of water in an environment where standing water is nonexistent, temperature is high, and humidity is low. Despite these handicaps, desert rats are able to maintain the osmotic pressure of their blood, as well as their total body-water content, at approximately the same levels as other rats. One countermeasure is behavioral: these rats stay in burrows during the hot part of the day, thus avoiding loss of fluid through panting or sweating, which are regulatory mechanisms for maintaining internal body temperature by evaporative cooling (evaporative cooling: 蒸发冷却). Also, desert rats’ kidneys can excrete a urine having twice as high a salt content as sea water.

Camels, on the other hand, rely more on simple endurance. They cannot store water, and their reliance on an entirely unexceptional kidney results in a rate of water loss through renal function significantly higher than that of desert rats. As a result, camels must tolerate losses in body water of up to thirty percent of their body weight. Nevertheless, camels do rely on a special mechanism to keep water loss within a tolerable range: by seating and panting only when their body temperature exceeds that which would kill a human, they conserve internal water.

Marine vertebrates experience difficulty with their water balance because though there is no shortage of seawater to drink, they must drink a lot of it to maintain their internal fluid balance. But the excess salts from the seawater must be discharged somehow, and the kidneys of most marine vertebrates are unable to excrete a urine in which the salts are more concentrated than in seawater. Most of these animals have special salt-secreting organs outside the kidney that enable them to eliminate excess salt.

261. Which of the following most accurately states the purpose of the passage?

(A) To compare two different approaches to the study of homeostasis

(B) To summarize the findings of several studies regarding organisms’ maintenance of internal variables in extreme environments

(C) To argue for a particular hypothesis regarding various organisms’ conservation of water in desert environments

(D) To cite examples of how homeostasis is achieved by various organisms（D）

(E) To defend a new theory regarding the maintenance of adequate fluid balance

262. According to the passage, the camel maintains internal fluid balance in which of the following ways?

I.      By behavioral avoidance of exposure to conditions that lead to fluid loss

II.     By an ability to tolerate high body temperatures

III.   By reliance on stored internal fluid supplies

(A) I only

(B) II only

(C) I and II only

(D) II and III only（B）

(E) I, II, and III

263. It can be inferred from the passage that some mechanisms that regulate internal body temperature, like sweating and panting, can lead to which of the following?

(A) A rise in the external body temperature

(B) A drop in the body’s internal fluid level

(C) A decrease in the osmotic pressure of the blood

(D) A decrease in the amount of renal water loss（B）

(E) A decrease in the urine’s salt content

264. It can be inferred from the passage that the author characterizes the camel’s kidney as “entirely unexceptional” (line 24) primarily to emphasize that it

(A) functions much as the kidney of a rat functions

(B) does not aid the camel in coping with the exceptional water loss resulting from the extreme conditions of its environment

(C) does not enable the camel to excrete as much salt as do the kidneys of marine vertebrates

(D) is similar in structure to the kidneys of most mammals living in water-deprived environments（B）

(E) requires the help of other organs in eliminating excess salt

这篇文章讲的是耗子骆驼和海洋动物吧。。。