if a species of parasite is to survive ,the host organisms must live long enough for the parasite to _____;if the host species becomes ____,so do its parasites. D succumb ;noviable B reproduce;extinct 我选的B答案选的D。 好像两个选项都能说通么。
far from being ____,Pat was always ____to apper acquiescent . A unctuous ;loath E gregarious ;willing 我选的E答案选A .
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发表于 2012-7-18 10:48:27
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