[解析]
(1)细节理解题。根据第二段The study integrates movement data from more than 329,000 birds of 112 species to identify the areas where migratory birds face the greatest threats from climate change and habitat loss.Researchers introduce a new way called multispecies migratory connectivity to measure these threats. (该研究整合了112个物种的329,000多只鸟类的迁徙数据,以识别候鸟面临气候变化和栖息地丧失最大威胁的区域。研究人员引入了一种名为"多物种迁徙连通性"的新方法来衡量这些威胁。)可知,多物种迁徙连通性是用来衡量候鸟面临的风险的。故选C。
(2)词句猜测题。根据第三段中划线词下文suggesting the threats faced by long﹣distance migrants (表明长途迁徙者面临的威胁)和Alarmingly,over half of the migration paths at very high risk involve breeding regions in the eastern United States. (令人担忧的是,超过一半的高风险迁徙路线涉及美国东部的繁殖区。)可知,研究结果表明,加拿大一些繁殖区与南美洲非繁殖区之间的迁徙路线尤其脆弱,vulnerable意为"脆弱的,易受伤的",和Easily damaged意思相近。A.Easily damaged容易损坏,容易破损;B.Equally improved同样的改善;C.Well protected受到良好的保护;D.Widely spread广泛传播。故选A。
(3)推理判断题。根据最后一段A 2019 study determined that there are nearly three billion fewer birds in North America than in the year 1970,with two﹣and﹣a﹣half billion of those birds considered migratory birds.The survival of many of these migratory species remains uncertain if countries do not take action to reduce climate pollution and the impacts of human activities that threaten birds and their habitats. (2019年的一项研究确定,北美地区的鸟类数量比1970年减少了近30亿只,其中25亿只是候鸟。如果这些国家不采取行动减少气候污染和人类活动对鸟类及其栖息地的威胁,许多迁徙物种的生存仍然不确定。)可推知,最后一段提到了2019年的研究是为了强调保护行动的必要性。故选B。
(4)标题归纳题。通读全文,尤其是第一段Today,scientists with the National Audubon Society published a study in which they propose a new way to identify where conservation efforts are most needed to ensure the survival for migratory birds that travel between Canada and South America. (如今,美国奥杜邦协会的科学家们发表了一项研究。在这项研究中,他们提出了一种新方法,用以确定在哪些地方最需要开展保护工作,从而确保在加拿大和南美洲之间迁徙的候鸟能够生存下来。)可知,本文主要讲的是美国奥杜邦协会的科学家们发表了一项研究,提出了一种新方法来确定在加拿大和南美洲之间迁徙的候鸟最需要保护的地方,因此D选项Scientists Identify Key Areas for Protecting Migratory Birds(科学家确定了保护候鸟的关键区域)很好地概括文章主旨,是文章的最佳标题。故选D。