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  3. One thing the tour books don’t tell you about London is that 2, 000 of its residents are foxes. They ran away from the city abou

One thing the tour books don’t tell you about London is that 2, 000 of its residents are foxes. They ran away from the city abou

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问题     One thing the tour books don’t tell you about London is that 2, 000 of its residents are foxes. They ran away from the city about two centuries ago after developers and pollution moved in. But now that the【S1】______is cleaner, the foxes have come home.
    "The number and variety of wild animals in【S2】______areas is increasing," says Gomer Jones. A survey of the wildlife in New York’s central Park last year counted 14 species of mammals. A similar survey【S3】______in the 1890s counted only five species.
    Several changes have brought wild animals to the cities. Foremost is that air and water quality in many cities have improved as a result of the 1970s【S4】______-control efforts. Meanwhile, rural areas have been built up, leaving many animals on the edges of【S5】______. In addition, urban wildlife refuges have been【S6】______. The Greater London Council last year spent 750,000 to buy land and build 10【S7】______wildlife refuges in the city. As a result, many birds are now living in the city. For peregrine falcons(游集)cities are actually safer than rural cliff dwellings.
    Cities can attract wild animals without turning them harmful. The trick is to create habitats where they can be self-【S8】______but still be seen and appreciated. Such habitats can even be functional. In Sail Francisco the【S9】______government is testing different kinds of rainwater control basins to see not only which ones【S10】______the cleanest water but which will attract the most birds.

[A] created                        [I] environment
[B] sufficient                     [J] urban
[C] conducted                      [K]sequence
[D] suburbs                        [L] local
[E] retain                         [M] noise
[F] earth                          [N] pollution
[G] conditions                     [O] permanent
[H] fierce
【S1】
选项
答案I
解析 上文提到狐狸逃离城市是因为开发者进驻和出现污染，“而现在由于______ 变得更干净，狐狸重新返回家园”，由此可知，I最符合文意。environment指自然环境，condition指的是一种状况、状态。
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大学英语四级

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