43. C　推理判断题。从第二段知，受气候的影响，兔子们遇到了困境。比如第三段提到的Lower Keys Marsh rabbit(湿地兔)和第四段提到的the snowshoe hare(雪兔)都反映出它们对环境变化的不适应，这才是造成它们受困的原因，所以选C项。

　　44. D　细节理解题。从第五段…they would naturally migrate(迁移) to higher ground—but they…They

　　can’t go any higher…和第六段…but there are not suitable plants for them to move higher…知，这两种兔子濒临灭绝的原因在于它们都无法进一步向高地迁徙。所以选D项。

　　45. B　观点态度题。从第一段…gets quite a bit worse for bunnies，以及全文字里行间作者对于兔子遭遇的表述可以看出，作者对于有些兔子濒临灭绝的现状表现出了关心和担忧，所以选B项。

　　C6[2012·山东卷]

　　The Pacific island nation of Nauru used to be a beautiful place. Now it is an ecological disaster area. Nauru's heartbreaking story could have one good consequence—other countries might learn from its mistakes.

　　For thousands of years, Polynesian people lived on the remote island of Nauru, far from western civilization. The first European to arrive was John Fearn in 1798. He was the British captain of the Hunter, a whaling ship. He called the island Pleasant Island.

　　However, because it was very remote, Nauru had little communication with Europeans at first. Then whaling ships and other traders began to visit, bringing guns and alcohol. These elements destroyed the social balance of the twelve family groups on the island. A ten­year civil war started, which reduced the population from 1,400 to 900.

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