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题目内容双击单词支持查询和收藏哦～
Despite growing evidence of a positive association between consumption of whole grains and long-term health, a research gap exists between observational studies and the elucidation of the mechanism involved, mechanisms that in some cases are still quite____________.
- A.ineffective
- B.speculative
- C.unproductive
- D.obscure
- E.unsubstantiated
- F.controversial
B,E显示答案
以上解析由 考满分老师提供。
