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题目内容双击单词支持查询和收藏哦～
At one time researchers viewed the placebo effect as (i)_____, a statistical (ii)_____ faced by those attempting an objective evaluation of the efficacy of potentially legitimate therapies. That view has changed: the placebo effect is today seen as an important part of the healing process.
- Blank(i)
- a boon
- a touchstone
- an impediment
- Blank(ii)
- increment
- annoyance
- deviation
an impediment , annoyance 显示答案
以上解析由 考满分老师提供。
