Zoos have become an important site for the preservation and protection of wildlife resources, (1) ________ those species that are endangered. (2) ________ , many zoos displayed live animals for public entertainment. Presently some zoos have become scientific and educational (3) ________ that have contributed to the understanding and conservation of wild animal populations. (4) ________ the challenges facing modern zoos are the cost of upgrading old facilities, the struggle to obtain (5) ________ operating funds, and the need to attract more visitors (6) ________ new and entertaining exhibits.
Many (7) ________ zoos in American cities have undergone renovation during the last decades of the twentieth century.Among the recent trends in zoo (8) ________ is the construction of new enclosures that resemble natural habitats. The replacement of steel bars and concrete floors (9) ________ appropriately designed surroundings improves visitor appreciation of the (10) _____. Such renovations may (11) ________ stress on animals and allow them to interact with one another (12) ________ naturally.
Several major zoos conduct captive propagation programs. A captive propagation problem includes the breeding of (13) ________ zoo or wild animals to obtain offspring, usually for release to (14) ________ or for transfer to other zoos.Captive breeding is one method of (15) ________ some species from extinction.
Zoos have expanded and improved public education programs also, with education departments that develop programs (16) ________ to zoo exhibits. Public activities include in-school programs, zoo tours, special events, and websites. The Zoological Society of New York, for example, conducted a (17) ________ project with a Western African to monitor an elephant herd (18) ________ it moved throughout its range.
The importance of zoos will increase as natural habitats are diminishing. Through their efforts (19) ________ conservation, education, and environmental advocacy, zoos (20) ________ continue to play a critical role in wildlife preservation throughout the world.
空格前面提到“preservation and protection of wildlife resources”， 后面提到 species that are endangered， 可以看出两者之间有一种包含关系， 而作者强调后面的部分， 尤其是那些濒临灭绝物种。 故 B 最符合题意。
后一句的开头为 Presently， 前后文做出对比， 所以空格后面提到 many zoos displayed live animals 应为过去的状况。 at one time 曾经。 故答案为 C。
空格处所在句是一个定语从句， 后面的从句对前面空格作出解释， 故推断该名 词应当表示某种机构。scientific and educational institutions 表示科教机构。 故 A 符合题意。
本句可以参照第 8 空所在句型“Among the recent trends in zoo (8) ________is the construction of new enclosures that resemble natural habitats” 意为“在......之中”。
sufficient operating funds 即充足的运作资金。 故 C 符合题意。
attract 一般与 to 搭配， 表示“把......吸引到......”。
因为空格后面提到 have undergone renovation 以及时间状语 during the last decades of the twentieth century，所以这里的动物园指的是美国的一些老的动物园。
前文提到 renovation， 后文的空格就应当与此处照应。 这里指动物园加以修正。
这里的 with 还表示“通过......用......”， 即用设计适宜的环境替代钢筋和混凝土地板。
这里指提高了动物的“可观赏度”。
拆除铁栏杆减轻了动物的压力。 故答案为 A。
拆除铁栏杆能让动物之间更好的交流、 互动。 故答案为 B。
空格前面提到“Several major zoos conduct captive propagation programs”， 所以后面提到同样的事情应当表示有所指。 selected 表示“选定的”。
后面提到了 for transfer to other zoos， 前面的内容一定和动物后代的生长环境有关。 动物生长的环境除了在动物园就是野外， 故 D 项符合题意。 the wild 表示“大自然”。
前文一直在谈及保护濒危物种， 所以 saving some species from extinction 指使部分物种免于灭绝。
be related to 与......相关。 因为前文提到了动物园里举办的一些特定活动， 所以空格处的内容应当表示“相关” 之意。
前文提到了 zoo exhibits， 所以 project with a Western African...的地位应当比较主要。
as 表示“正如......”。
后面提到“zoos…preservation throughout the world”， 证明前面应当做了不少支持。 故答案为 C。
本段整体时态为将来时， 所以该处也表示一种将来概念。 在这里 will 表示一种对将来的希望， 即动物园将在世界野生动物的保护中发挥至关重要的作用。 故答案为 B。