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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