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The main exception to primate researchers'general pattern of ignoring interactions between males and infants has been the study of male care among monogamous primates. It has been known for over 200 years, ever since a zoologist-illustrator named George Edwards decided to watch the behavior of pet marmosets in a London garden, that among certain species of New World monkeys males contributed direct care for infants that equaled or exceeded that given by females. Mothers among marmosets and tamarins typically give birth to twins, as often as twice a year, and to ease the female in her staggering reproductive burden the male carries the infant at all times except when the mother is actually suckling it. It was assumed by Kleiman that monogamy and male confidence of paternity were essential to the evolution of such care, and at the same time, it was assumed by Symons and others that monogamy among primates must be fairly rare.
　　Recent findings, however, make it necessary to reverse this picture. First of all, monogamy among primates turns out to be rather more frequent than previously believed (either obligate or
　　facultive monogamy can be documented for some 17-20 percent of extant primates) and second, male care turns out to be far more extensive than previously thought and not necessarily confined to monogamous species, according to Hrdy. Whereas previously, it was assumed that monogamy and male certainty of paternity facilitated the evolution of male care, it now seems appropriate to consider the alternative possibility, whether the extraordinary capacity of male primates to look out for the fates of infants did not in some way pre-adapt members of this order for the sort of close, long-term relationships between males and females that, under some ecological circumstances, leads to monogamy! Either scenario could be true. The point is that on the basis of present knowledge there is no reason to view male care as a restricted or specialized phenomenon. In sum, though it remains true that mothers among virtually all primates devote more time and/or energy to rearing infants than do males, males nonetheless play a more varied and critical role in infant survival than is generally realized.
　　1. The author of the passage mentions the work of Hrdy primarily to
　　A. present an instance of an untenable assumption
　　B. illustrate a consensus by citing a representative claim
　　C. provide evidence that challenges a belief
　　D. highlight a corollary of a widespread view
　　E. offer data that help resolve a debate
　　2. According to the passage, the evolutionary relationship between male care and monogamy is
　　A. incontestable
　　B. immutable
　　C. uncommon
　　D. immaterial
　　E. uncertain
　　3. The author of the passage suggests that it is “appropriate to consider the alternative possibility” because the previous view
　　A. results in a contradiction
　　B. depends on problematic data
　　C. appears less definite given certain facts
　　D. conflates two distinct phenomena
　　E. overlooks a causal relationship between correlated phenomena
　　4. Which of the following statements, if true, would pose the greatest challenge to “the alternative possibility”?
　　A. The number of primate species in which male care of infants is exhibited is greater than the number of primate species that practice monogamy.
　　B. Male care of infants among primates can be seen earlier in the evolutionary record than can monogamy among primates.
　　C. Monogamous relationships among primates can be found in species living in a variety of physical environments.
　　D. Most primate species that practice monogamy do not show any evidence of male care of infants.
　　E. Male care of infants can be observed in some primate species that lack male confidence of paternity.

参考答案
答案：CECA