17-18-1 定语从句及长句作业 1. You, whose ancestors pioneered the paths of modern civilization, have taken the road to higher forms of social organization and culture. 2. But art history focuses on much more than this because art reflects not only the political values of a people, but also religious beliefs, emotions, and psychology. 3. It is quite obvious that the organization of such a computer becomes rather complex, since one must insure that a mix-up does not occur among all the various problems and that the correct information is available for the computer when it is called for, but if not, the computation will wait until it is available. 4. On previous occasions, we expressed reservations about the possibility of obtaining general agreement on a definition of aggression and in fact questioned the desirability and utility, in the light of the international situation, of continuing the search for such a definition. (from the United Nations document) 5. Human beings have distinguished themselves from other animals, and in doing so ensured their survival, by the ability to observe and understand their environment and then either to adapt to that environment or to control and adapt it to their own needs. 6. Learning is, in too many cases, but a foil to common sense, a substitute for true knowledge. Books are less often made use of as spectacles to look at nature with, than as blinds to keep out strong light and shifting scenery from weak eyes and indolent disposition.