In addition, over the past 150 years, many non­native plants, mollusks(软体动物), insects, fish, birds, mammals, and diseases have found their way to Wisconsin. These “aliens” are often aggressive competitors with native wildlife, especially after they've left their own natural environments and controls.

　　Last but not least, some native wildlife can become a problem when released from their natural population controls. When wolves are scarce and hunters too few，white­tailed deer will often strip(剥夺) the woods of native wildflowers and even certain tree species, when their populations are allowed to become too high. Canada geese are beautiful birds, but when city people feed native geese as if they were pets, their populations can rise to uncomfortable levels in urban areas, resulting in polluted waterways and manure­laden lawns.

　　[语篇解读]文章主要叙述了Wisconsion面临的几个严重的威胁：由于人口增加野生动物栖息地减少；气候变化导致植物灭绝；一些野生动物数量的过度增长等。

　　5．What's the second paragraph mainly about?

　　A．Endangered wildlife.

　　B．Habitat Loss.

　　C．Adaptation to conditions.

　　D．Population growth.

　　【解析】　主旨大意题。根据文章第二段“fewer natural wildlife habitat areas are left each year”可知“每年所留下来的野生动物自然栖息地越来越少”，说明该段是讲“栖息地的丧失”，故正确答案为B项。

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