問題詳情：
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(錯覺) 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】
本文為説明文。文章介紹了近年來北極熊的生存狀況。
61．考查同位語從句。根據句子結構分析可知，主句為there be句型，且結構完整，空格後為同位語從句，解釋説明中心詞evidence的內容，故填that。
62．考查副詞用法。根據句意和結構分析可知，此處用副詞poorly修飾謂語動詞has been studied，意為“研究很少”。故填poorly。
63．考查介詞用法。此處tracking polar bear populations作Modern methods的定語，用of連接，“methods of doing sth.”意為“……的方法”，構成固定結構；或者意為“對於跟蹤北極熊的方法”用for。故填of/for。
64．考查非謂語動詞。句意：跟蹤北極熊數量的現代方法只是從二十世紀八十年代中期以來才開始採用，並且在如此大區域內持續採用是昂貴的。主系表結構之後常用不定式作原因或目的狀語。故此處填to perform。
65．考查時態。根據上下文語境，尤其是時間狀語in recent years可知，主句用現在完成時態，故填have reported。
66．考查名詞。根據其前不定冠詞和其後的同位語從句可知，空格處用名詞形式，故填belief。
67．考查非謂語動詞。根據其前介詞by可知，此處用動名詞作賓語，故填noting。
68．考查形容詞比較級。根據其後than they actually are可知，此處為形容詞的比較級，故填higher。
69．考查定冠詞。此處為特指，意為“在已識別的19個北極熊亞種羣中”，故填the。
70．考查主謂一致。根據three are declining，此處數詞six作主語，要用複數謂語，時態為一般現在時，故填are。
知識點：自然
題型：閲讀填空
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