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题目内容双击单词支持查询和收藏哦～
In clinical research into new treatments or the causal factors of diseases, randomized, double-blind controlled clinical trials are seen as (i)________ but, given their (ii)________ often are not feasible.
- Blank(i)
- a dead end
- the gold standard
- an unattainable ideal
- Blank(ii)
- expense
- predictability
- appeal
the gold standard , expense 显示答案
以上解析由 考满分老师提供。
