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发布时间：2006-06-22 13:31     点击：

　　(A) An assumption that the amount of carbon dioxide added to the atmosphere would in reality steadily increase

　　(B) An assumption that human activities are the only agencies by which carbon dioxide is added to the atmosphere

　　(C) Assumptions about the social and political consequences of any curtailment of the use of fossil fuels

　　(D) Assumptions about the physical conditions that are likely to prevail during the period for which the model was made

　　(E) Assumptions about the differential behavior of carbon dioxide molecules at the various levels of temperature calculated in the model

　　23. According to the passage, which of the following is true of the last hundred years?

　　(A) Fossil fuels were burned for the first time.

　　(B) Greater amounts of land were cleared than at any time before.

　　(C) The average temperature at the Earth's surface has become 2℃ cooler.

　　(D) The amount of carbon dioxide in the atmosphere has increased measurably.

　　(E) The amount of farmland worldwide has doubled.

　　Some modern anthropologists hold that biological evolution has shaped not only human morphology but also human behavior. The role those anthropologists ascribe to evolution is not of dictating the details of human behavior but one of imposing constraints- ways of feeling, thinking, and acting that "come natu- rally" in archetypal situations in any culture. Our "frailties" -emotions and motives such as rage, fear, greed, gluttony, joy, lust, love-may be a very mixed assortment, but they share at least one immediate quality: we are, as we say, "in the grip" of them. And thus they give us our sense of constraints.

　　24. The primary purpose of the passage is to present

　　(A) a position on the foundations of human behavior and on what those foundations imply

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