Q1.
A. is incorrect. The author says that the analogies at which ethologists look "can seriously mislead if we fail to look at the context of a particular item of behavior."
B. Out of scope. There is no implicit reference to the degradation of humanity in the passage.
C. Out of scope. The author no where in the passage claims that humans and cormorants are dissimilar species whereas humans and apes are similar.
D. The author does not refute this idea. The author says that ethological analysis between human behaviour and animal behaviour has its limitations.
E. is the correct answer. The author says in line 3, "True, humans are animals; they share certain anatomical features with other animals, and some items of human behavior may seem analogous to the behavior of other animals. But such analogies can seriously mislead if we fail to look at the context of a particular item of behavior."
He then builds on this claim by giving an example and concludes by saying, "Thus, ethologists can accomplish little—beyond reminding us that we are animals—until they study humans as cultural beings."
Q2.
A. is out of scope. Not mentioned in the passage.
B. The author believes the contrary. He says "such analogies can seriously mislead if we fail to look at the context of a particular item of behavior." In the lines 10 - 11 the author mentions, "Yet the cormorant’s twig-presentation simply inhibits attack and is comparable to other appeasement rituals found in many species. Human gift-giving differs in form and purpose not only from culture to culture, but within the same culture in various social contexts."
C. Out of scope. Not mentioned in passage.
D. is the correct answer. The author mentions in lines 12 - 15, "Human gift-giving differs in form and purpose not only from culture to culture, but within the same culture in various social contexts. Everything significant about it derives from its social context."E. is incorrect. The claim in this sentence is actually true for cormorants.
Q3.
The author is neither puzzled nor conciliatory not defensive nor amused in his approach.
E. is the correct answer. In the last line the author clearly states, "ethologists can accomplish little—beyond reminding us that we are animals—until they study humans as cultural beings."
Q4.
In lines 12 - 14, the author states, "Human gift-giving differs in form and purpose not only from culture to culture, but within the same culture in various social contexts."
D. This is the only option that most strongly supports the author's assertion. Here, in the same culture (North American), within different social contexts (letter carrier/garbage collector and employers/friends/relatives), the same gift is either considered acceptable or insulting.
This supports the author's claim that, "Everything significant about it (gift-giving in humans) derives from its social context."