2. 外语
  3. In his researches on ______ diseases, he discovered many facts about the lungs of animals and human beings.

In his researches on ______ diseases, he discovered many facts about the lungs of animals and human beings.

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问题 In his researches on ______ diseases, he discovered many facts about the lungs of animals and human beings.
选项 A、inherited
B、chronic
C、infectious
D、pulmonary
答案D
解析 (pulmonary肺的)。句意为：在研究肺病的过程中，他发现许多有关人和动物肺部的事实。A．inherited遗传的；D．chronic慢性的；C．infectious传染性的。
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