11. Schistosomiasis, a disease caused by a parasitic worm, has been enlarged by the habitat of the freshwater snails that are the parasite’s hosts during part of its life cycle. A) the freshwater snails that are the parasite’s hosts during part of its life cycle. B) freshwater snails which become the parasite’s hosts during part of its life cycles. C) freshwater snails which become the parasite’s hosts during part of their life cycles. D) Snails that become the hosts of parasite during the parasite’s life cycles.
这题关键不知道Life Cycle 是指谁的,Snails 还是Parasite 。我觉得是指Snails的,选C
大家看怎么样?
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