精选400句托福阅读长难句(OG&TPO)三十三
备考托福阅读的过程中，大家需要攻克长难句，这是最基本的内容。掌握长难句的解题技巧，能够辅助我们更好地来阅读文章。因此为大家汇总了OG和TPO中比较有代表性的长难句，供大家参考学习。
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321. Moreover, getting petroleum out of the ground and from under the sea and to the consumer can create environmental problems anywhere along the line.
322. The body that impacted Earth at the end of the Cretaceous period was a meteorite with a mass of more than a trillion tons and a diameter of at least 10 kilometers.
323. Only the last of these was suited at all to the continuous operating of machines, and although waterpower abounded in Lancashire and Scotland and ran grain mills as well as textile mills, it had one great disadvantage：streams flowed where nature intended them to and water-driven factories had to be located on their banks whether or not the location was desirable for other reasons.
324. In the 1760s, James Watt perfected a separate condenser for the steam, so that the cylinder did not have to be cooled at every stroke; then he devised a way to make the piston turn a wheel and thus convert reciprocating (back and forth) motion into rotary motion.
325. Coal gas rivaled smoky oil lamps and flickering candles, and early in the new century, well-to-do Londoners grew accustomed to gaslit houses and even streets.
326. Another generation passed before inventors succeeded in combining these ingredients by putting the engine on wheels and the wheels on the rails, so as to provide a machine to take the place of the horse.
327. When he grew older William Smith taught himself surveying from books he bought with his small savings and at the age of eighteen he was apprenticed to a surveyor of the local parish.
328. The companies building the canals to transport coal needed surveyors to help them find the coal deposits worth mining as well as to determine the best courses for the canals.
329. He later worked on similar jobs across the length and breadth of England all the while studying the newly revealed strata and collecting all the fossils he could find.
330. But as more and more accumulations of strata were cataloged in more and more places, it became clear that the sequences of rocks sometimes differed from region to region and that no rock type was ever going to become a reliable time marker throughout the world.
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