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1、45. The ensuing rapid expansion of irrigationagriculture, especially from the 1950s onward,transformed the economy of the region. continuing surprising initial subsequent53. If all of ones money is spent on clothes, theremay be none left to buy food or go to the movies.Similarly, a plant or animal c
2、annot squander all itsenergy on growing a big body if none would be leftover for reproduction, for this is the surest way toextinction. extend transform activate waste73. Several other mass extinctions in the geologicalrecord have been tentatively identified with largeimpacts, but none is so dramati
3、c as the Cretaceousevent. identified after careful study identified without certainty occasionally identified easily identified101. Turbulent waters tore into the hardened saltflats, broke them up, and ground them into thepebbles observed in the first sample taken by theChallenger. Fresh Deep Violen
4、t Temperate102. The source of Roman obsession with unityand cohesion may well have lain in the pattern ofRomes early development. thinking about fixation on interest in attitude toward 123. Because of the barrier of ice to the east, thePacific Ocean to the west, and populated areas tothe north, ther
5、e may have been a greater impetusfor people to move in a southerly direction. chance protection possibility incentive130. They could travel through the air, float inwater, and lie dormant for many months. hidden inactive underground preserved132. There are also sparsely distributed, highlynutritious
6、 fruits, and Bell found that only theThomsons gazelles eat much of these. widely thinly clearly freshly139. She began to address more ambitious themesin her dances such as The Sea, in which her dancersinvisibly agitated a huge expanse of silk, playedupon by colored lights. emerged from beneath creat
7、ed movement in arranged themselves in pretended to be142. It appears that unlike salt, dissolved organicsubstances are not excluded from the ice in thefreezing process. kept out compressed damaged gathered together 169. Toth has applied these criteria to thesimilarly made pebble tools from a number
8、ofearly sites (before 1.5 million years) at KoobiFora, Kenya, probably made by Homo habilis. standards findings17/4 8 XUANLE ideas techniques202. Maintaining a high body temperaturethrough sheer bulk is called gigantothermy. strength effort activity mass213. In the multiplicity of small-scale locale
9、galitarian or quasi-egalitarian organizations forfellowship, worship, and production thatflourished in this laissez-faire environment,individuals could interact with one another withina community of harmony and ideological equality,following their own popularly elected leaders andgoverning themselve
10、s by shared consensus whileminimizing distinctions of wealth and power. authority responsibility custom agreement215. The central state, though often very rich andvery populous, was intrinsically fragile, since thedevelopment of new international trade routescould undermine the monetary base and ero
11、destate power, as occurred when European seafarerscircumvented Middle Eastern merchants afterVasco da Gamas voyage around Africa in the latefifteenth century opened up a southern route. fundamentally surprisingly consequently particularly223. This development, coming as it did when thebottom had fal
12、len out of the European economy,provided an impetus to a long-held desire to securedirect relations with the East by establishing a seatrade. return opportunity stimulus obstacle225. Also beginning in the thirteenth century,there were new maps refined by precisecalculations and the reports of sailors that made itpossible to trace ones path with reasonableaccuracy. completed improved drawn checked239. Another flaw of the tiredness theory is thatyawning does not raise alertness or physiologicalactivity, as the theory would predict. fault aspect confusion mystery
