36.Two species of these finches, named for the way the upper and lower parts of their bills cross, rather than meet in the middle, reside in the evergreen forests of North American and feed on the seeds held within the cones of coniferous trees.

　　以他们上部和较低部分的嘴的交叉命名，而不是中间部分相遇的部分命名，这两种雀类居住在北美四季常青的森林里并且以包含在锥状的松果树球内的种子为食。

　　37.The beginning of a major change was foreshadowed in the later 1860’s, when the Union Pacific Railroad at last began to build westward from the Central Plains city of Omaha to meet the Central Pacific Railroad advancing eastward from California through the formidable barrier of the Sierra Nevada.

　　主要变化的开端在18世纪60年代晚期被预示了，当时在太平洋铁路联合体最后开始建设从Omaha的城市中心平原到连接太平洋铁路中心向西的铁路，它推进了从加利福尼亚穿过Sierra Nevada的重重险阻向东的铁路

　　38.The argument that humans, even in prehistoric, had some number sense, at least to the extent of recognizing the concept of more and less when some objects were added to or taken away from a small group, seems fair, for studies have shown that some animal possess such a sense.

　　关于人类即使是史前人类都具有一些数字的感觉的争论，当或多或少一些对象被从一个小团体内加入或拿走的概念，最后导致这个概念的认可，这看起来是公平的，因为研究表明一些动物拥也有这样的感觉。

　　39.A useful definition of an air pollutant is a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetation, or materials adversely.

　　一个有用的定义关于空气污染是被人类直接加入或间接加入到大气中，那些空气质量反面地影响人类、动物、植被或原材料的空气的混合体。

　　40.The tight arrangement enabled the Mandans to protect themselves more easily from the attacks of others who might seek to obtain some of the food these highly capable farmers stored from one year to next.紧凑的安排使曼旦人能更容易地，从那些寻找获得那些高产的农民们年复一年地存储的一些食物的其他族人的袭击中，保护他们自己。

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