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)