ThepolarbearisfoundintheArcticCircleandsomebiglandmasse...

问题详情：

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.

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.

【回答】

61．that

62．poorly

63．of/for

64．to perform

65．have reported

66．belief

67．noting

68．higher

69．the

70．are

【解析】

【分析】

本文为说明文。文章介绍了近年来北极熊的生存状况。

61．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．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．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．考查非谓语动词。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。主系表结构之后常用不定式作原因或目的状语。故此处填to perform。

65．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．考查名词。根据其前不定冠词和其后的同位语从句可知，空格处用名词形式，故填belief。

67．考查非谓语动词。根据其前介词by可知，此处用动名词作宾语，故填noting。

68．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．考查定冠词。此处为特指，意为“在已识别的19个北极熊亚种群中”，故填the。

70．考查主谓一致。根据three are declining，此处数词six作主语，要用复数谓语，时态为一般现在时，故填are。

知识点：自然

题型：阅读填空