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45．They were spurred by the inflation of the 1970's，which，combined with California's rapid population growth，pushed housing prices，as well as rents, to record levels．
(which引导非限定性定语从句)
它们受到了20世纪70年代通货膨胀的刺激，这次通货膨胀与加利福尼亚人口的迅速增长结合在一起，将房价与租金推到了创纪录的水平。
 
46．Implicit in it is an aesthetic principle as well：that the medium has certain qualities of beauty and expressiveness with which sculptors must bring their own aesthetic sensibilities into harmony．
(倒装结构Implicit in it is an aesthetic principle as well=An aesthetic principle is implicit in it as well，that引导的句子做principle的同位语)
其中也蕴涵一个美学原则：用于雕刻的媒介物有一定的美和富于表现力的特性，雕刻家必须使他们自己的审美感与这些特性融为和谐的—体。
 
47．With the turn-of-century Crafts movement and the discovery of nontraditional sources of inspiration，such as wooden African figures and masks，there arose a new urge for hands-on, personal execution of art and an interaction with the medium．
(there arose…是一个存在句)
随着世纪之交的手工艺运动和非传统灵感源泉(像非洲形体和面具)的发现，出现了一种亲自实践、亲手制作艺术和与媒介物直接接触的新要求。
48．The common kestrel roosts and hunts alone，but the lesser kestrel roosts and hunts in flocks，possibly so one bird can learn from others where to find insect swarms．
(possibly so=possibly so that)
普通红隼单独栖息和狩猎，但较小的红隼群栖群食，很可能因此一只鸟可以从其他鸟那儿了解到在哪儿可以找到成群的昆虫。
 
49．In the 1500s when the Spanish moved into what later was to become the southwestern United States，they encountered the ancestors of the modern day Pueblo，Hopi，and Zuni peoples．
(when引导定语从句，what引导的从句作moved into的宾语)
16世纪西班牙人进入后来成为美国西南部的地方时，他们遇到了今天皮艾布鲁人、霍比人和株尼人的祖先。
 
50．During the 1940's electron microscopes routinely achieved resolution better than that possible with a visible light microscope, while the performance of x-ray microscopes resisted improvement.
(that指代前面的resolution，possible with a visible 1ight microscope作that的定语)
20世纪40年代，电子显微镜通常比可见光显微镜的分辨能力更强，而X光显微镜的表现却没有改进。
 

蔬菜水果UID：3785791

62.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．
(特殊结构such…as to——如此…以致)
空气污染物的一个有用定义是：一种直接或间接加入到空气里的化合物，其数量足以对人类、动物、植物或物质产生不利影响。
 
63．The acute，growing public awareness of the social changes that had been taking place for some time was tied to tremendous growth in popular journalism in the late nineteenth century，including growth in quantity and circulation of both magazines and newspapers．
(awareness…was tied to tremendous growth…为句子主干)
公众对一段时间内一直在发生的社会变化敏锐的、不断增强的意识，与19世纪晚期通俗新闻的巨大增长(包括杂志和报纸在数量和发行量上的增长)紧密相连。
 
64．A detailed study has been made of the prints using photogrammetry，a technique for obtaining measurements through photographs，which created a drawing showing all the curves and contours of the prints．
(被动语态)
已经使用照相测量法(一种通过照相获得测量数据的技术)对这些脚印进行了一项详细的研究，这种方法产生了一张显示脚印所有曲线和轮廓的照片。
 
65．Footprints thus provide US not merely with rare impressions of the soft tissue of early hominids，but also with evidence of upright walking that in many ways is clearer than can be obtained from the analysis of bones．
(特殊结构not merely…but also；比较结构)
因此脚印不仅仅为我们提供早期人类软组织的稀有印记，而且为我们提供了直立行走的证据，这些证据在许多方面比骨头分析所提供的证据更清楚。
 
66．In fact，throughout the animal kingdom，from sponges to certain types of worms，shellfish，and all vertebrates(creatures possessing a spinal column), there is evidence that transplants of cells or fragments of tissues into an animal are accepted only if they come from genetically compatible or closely related individuals．
(从句that transplants…are accepted…作evidence的同位语)
实际上，从海绵到某些种类的蠕虫、有壳的水生动物和所有的脊椎动物(有脊柱的生物)的整个动物界都有证据表明，进入动物体的细胞或组织片断移植只有在来自基因上相容或关系密切的个体时才被接受。