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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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B选项：in 表示不了区间，需要用for; their没办法指代单数the parasite;
C选项：freshwater snails是特指一种淡水snail;单数的parasite的life circle应该是单数；
D选项：同C
E选项：两个hosts造成wordy,their hosts应该是its, during their life circles中their指代parasite or snails,指代不明确；
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