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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
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1、名词限定性由有没有逗号决定。
2、C选项中，freshwater snails 本来就是宿主，而不是become the hosts 成为宿主。另，its life cycle单复数
3、 of 、during 无差异，不考虑
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