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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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寄生虫是单数
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；
its应该是指代the parasite，但是我记得所有格中的名词是不能作为指代对象的，所以这里是为什么可以work？
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语义就是寄生虫的life cycle寄生虫是单数，所以their不对，cycles也不对（一个虫子对应一个生命周期）
考点单复数
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On the contrary, this choice implies that the habitat of freshwater snails (not any specific freshwater snails) has enlarged and by the way these snails become the parasite’s hosts. Thus, this choice no longer communicates the specificity of the freshwater snails as intended by the original sentence.
Choice E: This choice has similar meaning error as in choice C. It also has pronoun number error as in Choice B.
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