托福阅读长难句分析练习应该以在历年托福考试阅读中的句子为主，在练习的过程中大家要了解托福阅读文章中常见的长句子类型和结构，同时将句子中好的词汇和句子用法整理下来用于自己的托福写作中。今天前程百利小编为考生带来托福阅读长难句分析练习，大家可以在备考中进行学习。
1. 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.
2. Data from diverse sources, including geochemical evidence preserved in seafloor sediments, indicate that the Late Cretaceous climate was milder than today’s.
3. 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.
4. 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.
5. 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.
6. 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.
7. 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.
8. 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.
9. 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.
10. 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.
以上是前程百利小编为大家带来的托福阅读长难句分析练习二，希望大家可以好好利用，同时，大家在业余时间要多读，坚持下去便可在日后发现自己阅读能力的进步。预祝大家托福考试取得好成绩!
