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旅游团要求外出自费品尝风味食品，导游应______。
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3 The Greek’s lofty attitude toward scientific research—and the scientists’ contempt of utility—was a long time dying. For a millennium after Archimedes, this separation of me chanics from geometry inhibited fundamental technological progress and in some areas re pressed it altogether. But there was a still greater obstacle to change until the very end of the middle ages: the organization of society. The social system of fixed class relationships that prevailed through the Middle Ages (and in some areas much longer) itself hampered improvement. Under this system, the laboring masses, in exchange for the bare necessi ties of life, did all the productive work, while the privileged few—priests, nobles, and kings concerned themselves only with ownership and maintenance of their own posi tion. In the interest of their privileges they did achieve considerable progress in defense, in warmaking, in government, in trade, in the arts of leisure, and in the extraction of labor from their dependents, but they had no familiarity with the process of production. On the other hand, the laborers, who were familiar with manufacturing techniques, had no in centive to improve or increase production to the advantage of their masters. Thus, with one class possessing the requisite knowledge and experience, but lacking incentive and leis ure, and the other class lacking the knowledge and experience, there was no means by which technical progress could be achieved. The whole ancient world was built upon this relationship—a relationship as sterile as it was inhuman. The availability of slaves nullified the need for more efficient machinery. In many of the commonplace fields of human endeavor, actual stagnation prevailed for thou sands of years. Not all the glory that was Greece and the grandeur that was Rome could de velop the windmill or contrive so simple an instrument as the wheelbarrow—products of the tenth and thirteenth centuries respectively. For about twenty-five centuries, two-thirds of the power of the horse was lost because he wasn’t shod, and much of the strength of the ox was wasted because his harness wasn’t modified to fit his shoulders. For more than five thousand years, sailors were confined to rivers and coasts by a primitive steering mechanism which required remarkably little altera tion (in the thirteenth century) to become a rudder. With any ingenuity at all, the ancient plough could have been put on wheels and the ploughshare shaped to bite and turn the sod instead of merely scratching it—but the inge nuity wasn’t forthcoming. And the villager of the Middle Ages, like the men who first had fire, had a smoke hole in the center of the straw and reed thatched roof of his one-room dwelling (which he shared with his animals), while the medieval charcoal burner (like his Stone Age ancestor) made himself a hut of small branches. We may infer that a change in class reiationships after the close of the Middle Ages produced greater productivity because______.
设有带头结点的循环双链表表示的线性表L=(a1，a2，……，an-1，an)。设计在时 间和空间上都尽可能高效的算法，将L改造成L=(a1，a3，……，an,……a4，a2)。要求： (1)给出算法的基本设计思想。 (2)根据设计思想，采用C或C++或JAVA语言描述算法，关键之处给出注释。 (3)说明你所设计算法的时间复杂度和空间复杂度。
银行业从业人员在引用同事已经发表并获得著作权的论文及著述时，若是在内部文稿中交流，则不必提及来源。 ( )
对于无理取闹者，要坚持“______”的原则。
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