【正文】 nformation question a sking for specific information that can be found in paragraph 9. The correct answer is choice 4, bring salts to the surface. The paragraph says that the final human cause of desertification is salinization resu lting from overirrigation. The paragraph goes on to say that the overirrigation causes the water table to rise, bringing salts to the surface. There is no mention of the proce ss interfering with or limiting irrigation, or of the amount of air the soi l is required to absor b, so choices1,2, and 3 are all incorrect.9. ○3This is a Negative Factual Information que stion asking for specific information that can be found in the passage. Choice 3, insuffic ient irrigation, is the correct answer. Choice 1, soil erosion, is explicitly mentioned in paragraph 2 as one of the primary causes of desertification, so it is not the correct answer. Choice 2, global warning, is mentioned as a cause of de sertification in paragraph 4, so it is inc orrect. Choice4, raising of live stock, is de scribe d in paragraph 7 a s another cause of de sertification, so it is inc orrect. Thepassage include s excessive irrigation as a cause of desertification, but not its opposite, insufficient irrigation, so that is the correct answer.10. ○1This is a Sentence Sim plification question. As with all of the se items, a single sentence in the passage is highlighted:The extreme seriousness of desertification result s from the va st areas of land and the tremendous numbers of pe ople affected, as well as from the great difficulty of re versing or even slow ing the pr ocess.The correct answer is choice 1. That choice contains all of the e sse ntial information in the highlighted sentence and does not change it s meaning. The only substantive diffe re nce between choice 1 and the tested sentence is the order in whic h he information is pre sented. Two clauses in the highlighted sentence, The great difficulty of reversing the process and the numbers of pe ople affected, have simply bee n reverse d。s Early Sea Trade with Asia ............................................................................................. 35Animal Signals in the Rain Forest ............................................................................................... 35Symbiotic Relationships ............................................................................................................ 35TPO 18 ......................................................................................................................................... 35Industrialization in theNetherlandsandScandinavia ...................................................................... 35The Mystery of Yawning ........................................................................................................... 35Lightning ................................................................................................................................ 35TPO19 .......................................................................................................................................... 36The Roman Army’s Impact on Britain ......................................................................................... 36Succession, Climax, and Ecosystems ........................................................................................... 36Discovering the Ice Ages ........................................................................................................... 36OFFICIAL GUID E RE ADING ..................................................................................................................... 38Applie d Arts and Fine Arts ........................................................................................................ 38Aggression .............................................................................................................................. 39Artisans and Industrialization .................................................................................................... 43Swimming Machines ................................................................................................................ 47Nineteenthcentury Politics in the U nited States.......................................................................... 50The Expression of Em otions ...................................................................................................... 54Geology and Landscape ............................................................................................................ 58Feeding Habits of East African Herbivores ................................................................................... 61Loie Fuller .............................................................................................................................. 62Green Icebergs........................................................................................................................ 63ONLINE TES T .................................................................................................................................... 64Opportunists and Com petitors .................................................................................................. 64Lascaux Cave Paintings ............................................................................................................. 65Electricity from Wind ............................................................................................................... 66OFFICIAL M ODEL TES T ........................................................................................................................ 67Meteorite Impact and Dinosaur Extinction ................................................................................. 67TPO 1Groundwater1. ○ 32. ○ 33. ○ 24. ○ 45. ○ 46.