有很多同学因为碰见没有准备过的托福听力素材而失去了先机，错失高分，那么小编就和大家来总结一下2017年托福听力Lecture1出现过哪些话题?大家了解了一下素材，希望能对各位备考托福有帮助。

　　2017年1月7日-托福听力Lecture1真题

　　话题分类：Anthropology (集会营销)

　　内容回忆：教授说，同学们，你们注意过吗?球赛的时候，会有好多小摊贩卖东西。这种现在早几个世纪前就有了。当时有一个叫 H 的民族，他们有很多球场，在这些球场发现了很多陶罐，这些陶罐来自于5个不同地区且功能都不同。这就很奇怪了，因为这个民族的生产是去中心化的，但是他们的产品却能够相互协调补充。而且这种去中心化的市场理论上应该是很不可靠的，因为你不能指望你需要的都能买到。但是 H 民族的市场却很可靠。而且，他们在集会时候卖陶罐，可以让那些住在人口稀少地区的人也可以趁球赛来买，此外，他们的销售量会增大。有意思的事，一段时间后， H 民族的球场骤然减少，随之减少的还有某种陶罐。

　　2017年1月14日-托福听力Lecture1真题

　　话题分类：艺术

　　内容回忆：教授讲了 Lithography。在平板印刷术出现之前，艺术对普通人而言很昂贵，而平版印刷因其廉价的制作过程，可以很容易被大量制造(有题)，于是这种艺术走进了美国人的家庭。两个平板印刷艺术家开始在报纸上使用平版印刷。这些艺术往往都是关于人们的日常生活，或者是关于美国西部的风景，因为当时美国还未西进运动，很多东部的居民并不了解西部的具体风貌(有题)。同时，报纸上会有很多关于自然以及乡村风貌的艺术，这是因为工业化的影响，有很多人对自然以及乡村景色产生了怀旧(有题)。但是，有些人认为，这两位艺术家忽视了当时的经济及政治新闻，其实这些人没有考虑到两位艺术家只是在满足观众的需求(有题)。

　　2017年2月18日-托福听力Lecture1真题

　　话题分类：地质

　　内容回忆：地球密度为水的 5.5 倍，结构为三层，人为探测只能探到地下数千米，更深的地质如何探测呢?一个机智的英国科学家到山上做实验，在一个 isolated 的大山旁悬挂，发现绳子与垂直地面有一个 slight angle，根据测算大山的密度(ratio) 可以推算地球密度算出是水的 4 倍，能利用这么少的工具算出近似答案很 surprising.

　　2017年2月25日-托福听力Lecture1真题

　　话题分类：天文学

　　内容回忆：

　　Photographic evidence suggests that liquid water once existed in great quantity on the surface of Mars. Two types of flow features are seen: runoff channels and outflow channels. Runoff channels are found in the southern highlands. 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. They bear a strong resemblance to river systems on Earth, and geologists think that they are dried-up beds of long-gone rivers that once carried rainfall on Mars from the mountains down into the valleys. Runoff channels on Mars speak of a time 4 billion years ago (the age of the Martian highlands), when the atmosphere was thicker, the surface warmer, and liquid water widespread.

　　Outflow channels are probably relics of catastrophic flooding on Mars long ago. They appearonly in equatorial regions and generally do not form extensive interconnected networks.Instead, they are probably the paths taken by huge volumes of water draining from the southern highlands into the northern plains. The onrushing water arising from these flash floods likely also formed the odd teardrop-shaped “islands” (resembling the miniature versions seen in the wet sand of our beaches at low tide) that have been found on the plains close to the ends of the outflow channels. Judging from the width and depth of the channels, the flow rates must have been truly enormous―perhaps as much as a hundred times greater than the 105 tons per second carried by the great Amazon river. Flooding shaped the outflow channels approximately 3 billion years ago, about the same times as the northern volcanic plains formed.

　　Some scientists speculate that Mars may have enjoyed an extended early Period during which rivers, lakes, and perhaps even oceans adorned its surface. 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. Other researchers go even further, suggesting that the data provide evidence for large open expenses of water on the early Martian surface. A computer-generated view of the Martian north polar region shows the extent of what may have been an ancient ocean covering much of the northern lowlands. 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.