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阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。
The polar bear is found in the Arctic Circle and some big land masses as far south as Newfoundland. While they are rare north of 88°, there is evidence___61___ they range all the way across the Arctic, and as far south as James Bay in Canada. It is difficult to figure out a global population of polar bears as much of the range has been ___62___(poor) studied; however, biologists calculate that there are about 20,000-25,00
0 polar bears worldwide.
Modern methods ___63___ tracking polar bear populations have been employed only since the mid-1980s, and are expensive ___64___(perform) consistently over a large area. In recent years some Inuit people in Nunavut___65___(report) increases in bear sightings around human settlements, leading to a ___66___(believe) that populations are increasing. Scientists have responded by ___67___(note) that hungry bears may be congregating(聚集) around human settlements, leading to the illusion(错觉) that populations are___68___(high) than they actually are. Of___69___ nineteen recognized polar bear subpopulations, three are declining, six____70____(be) stable, one is increasing, and nine lack enough data.
正确答案
61. that 62. poorly 63. of/for 64. to perform 65. have reported 66. belief 67.noting 
68. higher 69. the 70. are
答案解析
本文为说明文，文章层次分明，阅读有一定的难度。文章介绍了近年来北极熊的生存状况，紧紧围绕近年来话题热点。
61.空格句为：…… there is evidence___61___ they range all the way across the Arctic …… ，句子为主从复合句结构，主句为there be句型，且结构完整，空格后为同位语从句，解释说明中心词evidence的内容。显然考查考查同位语从句。故填that。
62.空格句为：It is difficult to figure out a global population of polar bears as much of the range has been ___62___(poor) studied;句子中用副词poorly修饰谓语动词has been studied，意为“研究很少”。考查副词用法：副词修饰动词，故填poorly。
63.空格句为：Modern methods ___63___ tracking polar bear populations have been employed only since the mid-1980s …… 句中tracking polar bear populations作Modern methods的定语，用of连接。短语结构“methods of/for doing sth.”意为“……的方法”。意为“对于跟踪北极熊的方法”。此题考查介词用法，故填of/for。
64.空格句为：Modern methods ___63___ tracking polar bear populations have been employed only since the mid-1980s, and are expensive ___64___(perform) consistently over a large area. 句意：跟踪北极熊数量的现代方法只是从二十世纪八十年代中期以来才开始采用，并且在如此大区域内持续采用是昂贵的。句中主系表结构之后用不定式to perform作状语。此题考查非谓语动词，故此处填to perform。
65.空格句：In recent years some Inuit people in Nunavut___65___(report) increases in bear sightings around human settlements, leading to a ___66___(believe) that populations are increasing.根据上下文语境可知，时间状语in recent years提示主句用现在完成时态。此题显然考查时态，故填have reported。
66.空格句为：leading to a ___66___(believe) that populations are increasing.根据其前不定冠词a和其后的同位语从句 that populations are increasing可知，空格处用名词形式，故填belief。
67.空格句为：Scientists have responded by ___67___(note) that hungry bears may be congregating(聚集) around human settlements…… ，空格前有介词by，且后面有从句可知，此处用动名词作宾语。考查非谓语动词。故填noting。
68.空格处为：…… that populations are___68___(high) than they actually are.其后than they actually are可知，此处为形容词的比较级，故填higher。
69.空格处为Of___69___ nineteen recognized polar bear subpopulations……,此处为特指，意为“在已识别的19个北极熊亚种群中”，故填定冠词the。
70.根据three are declining和one is increasing可知，此处数词six作主语，要用复数谓语，而且时态为一般现在时。此题考查主谓一致和时态，故填are。
