A.They are a couple.
B.They are schoolmates.
C.They are doctor and nurse in a hospital.
D.They are boss and secretary in a company.
第7题
(下列各题共用备选答案) A.蛔虫 B.蛲虫 C.绦虫 D.钩虫 E.阴道滴虫 槟榔善杀
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