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2017-2019高考真题分项汇编专题21语法填空(英语 解析版)
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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 20,000-25,000 polar bears worldwide.
Modem 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 Nunayut ___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.
【语篇解读】本文为科普文类说明文,介绍了北极熊的生存现状。
 61.
【解析】考查同位语从句。根据句子结构分析可知,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,故填that。
 62.
【解析】考查副词用法。根据句意和结构分析可知,此处用副词poorly修饰谓语动词has been studied,意为“研究很少”。故填poorly。
 63.
【解析】考查介词用法。此处tracking polar bear populations作Modern methods的定语,用of 连接,“methods of doing sth.”,意为“……的方法”,构成固定结构。或者意为“对于跟踪北极熊的方法”用for。故填of/for。
 64.
【解析】考查非谓语动词。主系表结构之后,常用不定式作原因或目的状语,句意:跟踪北极熊的现代方法只是在二十世纪八十年代以来开始采用,并且在如此大区域内持续采用是昂贵的,故此处用to perform。
 65.
【解析】考查时态。根据上下文语境,尤其是时间状语in recent years可知,主句用现在完成时态,故填have reported。
 66.
【解析】考查名词。根据其前不定冠词和其后的同位语从句可知,空格处为名词形式,故填belief。
 67.
【解析】考查非谓语动词。根据其前介词by可知,此处用动名词主动形式,故填noting。
 68. higher
【解析】考查形容词比较级。根据其后than they actually are可知,此处为形容词的比较级,故填higher。
 69.
【解析】考查定冠词。此处为特指,意为“在已知的19个北极熊亚种群中”,故填the。
 70.
【解析】考查主谓一致。根据three are declining,此处数词six作主语,代指前文中的“polar bear subpopulations”,故用复数谓语,一般现在时,故填are。
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