4. 다음 글에서 전체 흐름과 관계 없는 문장은?
A variety of theoretical perspectives provide insight into immigration. Economics, which assumes that actors engage in utility maximization, represents one framework. ① From this perspective, it is assumed that individuals are rational actors, i.e., that they make migration decisions based on their assessment of the costs as well as benefits of remaining in a given area versus the costs and benefits of leaving. ② Benefits may include but are not limited to short-term and long-term monetary gains, safety, and greater freedom of cultural expression. ③ People with greater financial benefits tend to use their money to show off their social status by purchasing luxurious items. ④ Individual costs include but are not limited to the expense of travel, uncertainty of living in a foreign land, difficulty of adapting to a different language, uncertainty about a different culture, and the great concern about living in a new land. ⑤ Psychic costs associated with separation from family, friends, and the fear of the unknown also should be taken into account in cost-benefit assessments.
5. 다음 글의 내용을 한 문장으로 요약하고자 한다. 빈칸 (A), (B)에 들어갈 말로 가장 적절한 것은?
Even those with average talent can produce notable work in the various sciences, so long as they do not try to embrace all of them at once. Instead, they should concentrate attention on one subject after another (that is, in different periods of time), although later work will weaken earlier attainments in the other spheres. This amounts to saying that the brain adapts to universal science in time but not in space. In fact, even those with great abilities proceed in this way. Thus, when we are astonished by someone with publications in different scientific fields, realize that each topic was explored during a specific period of time. Knowledge gained earlier certainly will not have disappeared from the mind of the author, but it will have become simplified by condensing into formulas or greatly abbreviated symbols. Thus, sufficient space remains for the perception and learning of new images on the cerebral blackboard.
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Exploring one scientific subject after another \hspace{0.5cm}(A)\hspace{0.5cm} remarkable work across the sciences, as the previously gained knowledge is retained in simplified forms within the brain, which \hspace{0.5cm}(B)\hspace{0.5cm} room for new learning.