Which of the following is CORRECT about the decline of birds in Europe？A．The quantity of b
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Which of the following is CORRECT about the decline of birds in Europe？
A．The quantity of birds in Europe dropped by about 500 million.
B．90% of the drop in Europe occurred in the last decade.
C．Ms. Thatcher was the first one to notice the decline.
D．The most common species are the most vulnerable.
请帮忙给出正确答案和分析，谢谢！
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正确答案：A
细节题。由题干中的declineofbirdsinEurope定位至第一段第二句。定位句中明确表示，1980年，欧洲有鸟类2．1billion(21亿)，现在只有1．6billion(16亿)，因此，鸟类数量减少了5亿，故[A]为答案。