B. Some flowers have appeared ahead of time.

　　C. Apple trees have produced less fruit.

　　D. Plants have provided no food to birds.

　　答案解析：答案为B。本题为细节推理题。由第三段 “In North America alone, scientists have identified 89 species of plants, such as the American holly that have flowered earlier in the spring. In Spain, apple trees bloom 35 days ahead of schedule...”可知，花卉提前开放。故答案为B。

　　3. What can be learnt about robins from the passage?

　　A. They are good at telling the direction.

　　B. They can predict the change of weather.

　　C. They usually come back when spring comes.

　　D. They have to move away for cool weather.

　　答案解析：答案为C。本题为细节推理题。由倒数第二段 “To try to follow this time shift, some birds such as robins, the classic symbol of winter's thaw, are returning to Colorado from their migrations some two weeks earlier than in years past.” 可知，robin鸟是冬天解冻时期的象征，比往年要早两周回到Colorado，故可以推断，这些鸟在春天天气暖和后才回来，由于全球气温升高，他们可以早点回到Colorado。故答案为C。

　　4．What does the passage mainly tell us?

　　AMan-made warming changes nature’s clock.

　　B. Global warming is unavoidable.

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