单项选择题

The passage is primarily concerned with discussing（）

A．how anthropologists ought to explain the origins of the trade relationship between foragers and agriculturalists
B．why it is difficult to measure the amount of time necessary for the disappearance of carbohydrate-rich plant species in the rain forest
C．why a particular account of the unavailability of carbohydrates to rain forest foragers is inaccurate
D．what ought to be included in any account of the effects of forager peoples on rain forest ecology
E．what data are most relevant for an accurate account of the relations between rain forest foragers and agriculturalists

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单项选择题

The author of the passage uses the second paragraph to（）

A．summarize the main point of the refutation to the argument discussed in the passage
B．explain why the hypothesis under criticism in the passage has been disparaged by critics
C．suggest an alternate explanation that undermines the premises of the hypothesis critiqued in the passage
D．introduce a hypothesis that will be discussed in detail later in the passage
E．present evidence that is intended to qualify the critique of the hypothesis being discussed in the passage

单项选择题

The tone of the author of the passage in describing theories of co-evolution can best be described as one of（）

A．appreciation of the theory's ability to explain the disappearance of certain carbohydrate-rich plant species
B．admiration for the theory's refutation of the seed-disbursal theory of the disappearance of the carbohydrate-rich plant species
C．skepticism toward the theory's ability to account for the evolution of trade relations between agriculturalists and foragers
D．annoyance at the theory's failure to account for such phenomenon as the success of the sago palm
E．concern that the theory may be insufficient to discredit the Headland Hypothesis