2. 外语
  3. What is the main idea of the passage? The pronoun "They" in the second paragraph refers to______.

What is the main idea of the passage? The pronoun "They" in the second paragraph refers to______.

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问题 What is the main idea of the passage?
The pronoun "They" in the second paragraph refers to______.
选项 A、ornithology and general biological science
B、contributions
C、professional biologists
D、birds
答案C
解析 考查考生在语篇水平上正确地理解词、短语或句子的能力。参阅第二段第一句“Professional biologists are not hard put to reel off a list of distinctive contributions that ornithology has made to general biology science．”可知，They=professional biologists。
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