While tributyltin (TBT) is generally not as (i)______as certain other toxic subs

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问题 While tributyltin (TBT) is generally not as (i)______as certain other toxic substances, studies of damaging effects on marine life show it is (ii)______to mollusk fisheries.

选项

答案 C,E

解析 While说明前后反义重复;not取反。两空联动,同义重复;第一空与toxic(有毒的)同义重复。neutral中立的,controversial有争议的,dangerous危险的;essential必要的,devastating破坏的,attracted被吸引的。答案选CE。
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