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【单选题】
寄生虫病流行的三个基本环节是:A.
传染源、传播方式和易感人群
B.
传播方式、传播途径和易感人群
C.
传播时间、传播方式和传播途径
D.
传染源、传播途径和易感人群
E.
传播时间、传播方式和传染源
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【简答题】In towns near the sea, the ____ lanterns are placed into the water when the festival is over.
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