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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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the parasite's hosts for part of its life cycle
要注意指代词到底在指代谁！！！
B问中的their 指代复数，但是parasite是单数。。根本没有看到A B中their和its的区别。。
D one parasite can only have one lifecycle
特指是parasite host的那一种freshwater snail，所以要加the。而且原文说的是part of life cycle，D省略了这个信息，改变了原意。
E的话就是一个范畴，主语和表语的关系，所以E 不对
become 变成 are是 snail肯定是host，不可能是变成host
寄生虫是单数
parasite 是单数》。。。。。
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；
the parasite's hosts for part of its life cycle
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？
同问
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its refers to the disease.
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。。
their life cycle，its life cycles，单复数都有点问题
这个it指代的是什么？a disease? a parasite worm? life cycle是谁的cycle？？？
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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c The original sentence clearly stated that the habitat of specific freshwater snails has enlarged. These snails are the parasite’s hosts.
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.
不是become 它本来就是。
https://e-gmat.com/blogs/schistosomiasis-a-disease-caused-by-a-parasitic-worm%E2%80%A6gmatprep/
Choice D: This choice has similar error as choice C does. In addition, this choice is more wordy since it does not use pronoun “its”. It repeats the noun – parasite’s.
Choice E: This choice has similar meaning error as in choice C. It also has pronoun number error as in Choice B.
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