扫描二维码，直接登录
题库 / OG2017V-SC-284
Schistosomiasis, a disease caused by a parasitic worm, is prevalent in hot, humid climates, and it has become more widespread as irrigation projects have enlarged the habitat of the freshwater snails that are the parasite's hosts for part of its life cycle.
the freshwater snails that are the parasite's hosts for part of its life cycle
the freshwater snails that are the parasite's hosts in part of their life cycle
freshwater snails which become the parasite's hosts for part of its life cycles
freshwater snails which become the hosts of the parasite during the parasite's life cycles
parasite's hosts, freshwater snails which become their hosts during their life cycles
还没有题目讲解（毕出老师会陆续发布对官方考题的解读，请保持关注）。
我就想知道为什么不能是the snails' life cycle，如果是snails的 part of their life cycle也make sense啊。。
登录 或 注册 后可以参加讨论