17. (選擇題) What's correct？
(A) Human may acquire Trichinella spiralis infection through skin surface while staying in contaminated river,
(B) Infective oocyst of Isosporora contains 4 sporocysts and each sporocyst contains 2 sporozoites,
(C) Human may acquire hydatid infection by ingesting food or drink contaminated by eggs of Echinococcus granulosus,
(D) all of above. (2.5 分)

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