and mating patterns to survive.

　　To try to follow this time shift, some birds such as robins, the classic symbol of winter's thaw(解冻时期) , are returning to Colorado from their migrations (迁徙)

　　some two weeks earlier than in years past. All these changes can throw a food chain in disorder. Some bird species that arrive before the insects reappear may starve to death.

　　"Around the world, plants and animals are waking up to an earlier alarm clock than they used to," says Terry Root, a biologist from Stanford University.

　　1. What does the first paragraph mainly present to the readers?

　　A. The survival of polar bears in the Arctic.

　　B. The terrible situation for the coastal town along Florida.

　　C. A brief description of what a warming world will look like.

　　D. A new analysis of climate change in Nature.

　　答案解析：答案为C。本题为段落大意题。细读第一段，先描述气候变化的几个严重后果的例子，最后进行概括总结，故答案为C。A，B选项都是后果之一，D选项不是第一段的重点。注意把握最后一句 “These are just a few examples of the serious consequences of…”, 答案就不难选择。

　　2. According to the passage, what has happened to plants as a result of warming climate?

　　A. Many species of plants have died out.

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