2. 外语
  3. What is the main idea of the passage? David Lack’ s research contributed to biological science specifically in the area of_____

What is the main idea of the passage? David Lack’ s research contributed to biological science specifically in the area of_____

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问题 What is the main idea of the passage?
David Lack’ s research contributed to biological science specifically in the area of______.
选项 A、Evolution
B、mating behavior
C、animal demography
D、immunology
答案C
解析 本题答案可参考第二段第三句，本题中contribute to=be helpful to是“对……有贡献”的意思。
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