标题: OG Verbal 分册 2th -- 92题 [打印本页] 作者: 三零年代 时间: 2010-8-15 12:46 标题: OG Verbal 分册 2th -- 92题 Schistosomiasis, a disease cused by a prasitic 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.
A) the freshwater snails that are the parasite's hosts for part of its life cycle B) the freshwater snails that are the parasite's hosts in part of its life cycle