Which of the following most accurately states the purpose of the passage? It can be inferred from the passage that the author c

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问题 Which of the following most accurately states the purpose of the passage?
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______

选项 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
E、requires the help of other organs in eliminating excess salt

答案B

解析 This question asks you to identify an attribute of the camels’ kidney that the description “entirely unexceptional” emphasizes in the passage. The best answer is choice B. The preceding paragraph concludes with a statement about how desert rats’ unusual kidney function aids their homeostasis; by calling the camel’s kidney function aids their homeostatic; by calling the camel’s kidney, in contrast, “entirely unexceptional,’ the author emphasizes the fact that camels, who also inhabit the desert, cannot similarly rely on specialized kidney function to aid in homeostasis. Choice A can be eliminated because the author has just pointed out that desert rats’ kidney “entirely unexceptional” suggests that the two animal’s kidneys in fact function differently. Choice C is not correct because there is no suggestion that the author is attempting to compare the functioning of camels’ kidneys with the functioning of marine vertebrates’ kidneys. Choice D is incorrect because the passage does not provide sufficient information to infer what kidney structure is typical of mammals who inhabit water-deprived environments. Choice E is incorrect because it is marine vertebrates, not camels, whom the author describes as having special organs that help in eliminating excess salt.
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