ChaseDream

标题: 3 月9日作业 [打印本页]

作者: belinda_cao 时间: 2014-3-8 21:31
标题: 3 月9日作业
【3月9日作业】

听力，在2014年3月8日这一天的早上，Colin生病了，祝福Colin生病尽快恢复，活到100岁！

http://v.youku.com/v_show/id_XMjY1MTIwNDky.html

TED地址：

【3月9日长难句】

1）as she put it in the common reader , “it is safe to say that not a single law has been framed or one stone set upon another because of anything chaucer said or wrote ; and yet , as we read him , we are absorbing morality at every pore .”（5-）

2）with the conclusion of a burst activity , the lactic acid level is high in the body fluids , leaving the large animal vulnerable to attack until the acid is reconverted , via oxidative metabolism , by the liver into glucose , which is then sent (in part )back to the muscles for glycogen resynthesis .（4+）

【3月9日阅读题目】

   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 boy-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. 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 30 percent of their body weight. Nevertheless, camels do rely on a special mechanism to keep
water loss within a tolerable range:by sweating 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 adeuate 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 tolearte 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 enbale 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

作者: belinda_cao 时间: 2014-3-11 10:41
BBBB ,第一题错了。

欢迎光临 ChaseDream (https://forum.chasedream.com/)