【正文】 lly mammoths, saber toothed tigers and other ancient animals, as well as dozens of other megafauna (large animals over 100 lb (45kg)) such as giant sloths, horses, mastodons, and American lion that dominated the area of the ancient Great Planis for million of years. The vast majority of these animals went extinct in North America around 13,000 years ago during the end of the Pleistocene.　　第二篇：動(dòng)物的遷徙　　主要講動(dòng)物如何遷徙，原因不同。下附金星和地球?qū)Ρ鹊南嚓P(guān)文章。澳際教育旗下高端語言培訓(xùn)品牌——好好學(xué)好好學(xué)：2013年7月20日托福閱讀考試真題解析　　第一篇：地址對(duì)美國經(jīng)濟(jì)的影響　　講美國的各種地質(zhì)特點(diǎn)促進(jìn)農(nóng)業(yè)發(fā)展，進(jìn)而促進(jìn)經(jīng)濟(jì)發(fā)展，包括：風(fēng)的作用形成平原，使金屬礦物得以挖掘，冰川回退留下肥沃土地等等，最終對(duì)全世界各地的農(nóng)業(yè)及經(jīng)濟(jì)發(fā)展產(chǎn)生良好影響。Venus pared with the EarthVenus is often named as Earth’s twin because both worlds share a similar size, surface position and have an atmosphere with a plex weather system.The figure on the right pares Venus and Earth spacecraft surface of Venus is shown in orange as radar images while the atmosphere is reproduced on near true colors as it would be seen by the human upper clouds are brightest in the blue and ultraviolet wavelengths making Venus a whiteblue color planet. Both planets have almost the same size and density and Venus is only a 30% closer to the Sun than Earth. Both share an interesting geological evolution with old volcanoes in Venus and some of them could still be active. One of the biggest mysteries of Venus is why its surface is so young on geological timescales. It is interesting to remark that there is almost no water on Venus’s atmo