精选400句托福阅读长难句(OG&TPO)二十一
托福阅读复习备考中的一大难点就是长难句，想要更好地攻克长难句，大家对于这部分还是要详细的练习。具体的托福阅读中都有哪些经典的长难句呢?网站为大家汇总了这部分的内容，供大家参考。
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201. Off and on throughout the Cretaceous (the last period of the Mesozoic era, during which dinosaurs flourished), large shallow seas covered extensive areas of the continents.
202. Data from diverse sources, including geochemical evidence preserved in seafloor sediments, indicate that the Late Cretaceous climate was milder than today’s.
203. It’s hard to understand why they would not be affected, whereas dinosaurs were left too crippled to cope, especially if, as some scientists believe, dinosaurs were warm-blooded.
204. In view of these facts, scientists hypothesized that a single large asteroid, about 10 to 15 kilometers across, collided with Earth, and the resulting fallout created the boundary clay.
205. These flow features are extensive systems ―sometimes hundreds of kilometers in total length ―of interconnecting, twisting channels that seem to merge into larger, wider channels.
206. A 2003 Mars Global Surveyor image shows what mission specialists think may be a delta―a fan-shaped network of channels and sediments where a river once flowed into a larger body of water, in this case a lake filling a crater in the southern highlands.
207. The Hellas Basin, which measures some 3,000 kilometers across and has a floor that lies nearly 9 kilometers below the basin’s rim, is another candidate for an ancient Martian sea.
208. Furthermore, Mars Global Surveyor data released in 2003 seem to indicate that the Martian surface contains too few carbonate rock layers ―layers containing compounds of carbon and oxygen ―that should have been formed in abundance in an ancient ocean.
209. Aside from some small-scale gullies (channels) found since2000, which are inconclusive, astronomers have no direct evidence for liquid water anywhere on the surface of Mars today, and the amount of water vapor in the Martian atmosphere is tiny.
210. It had been assumed that the ice extended westward from the Alaskan/Canadian mountains to the very edge of the continental shelf, the flat, submerged part of the continent that extend into the ocean.
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