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题目内容双击单词支持查询和收藏哦～
To help protect the environment, the United States government currently requires safe storage of coal ash for 30 years, "if feasible," but many countries that burn coal lack even such _____________ environmental safequards.
- A.modest
- B.onerous
- C.discretionary
- D.burdensome
- E.practical
- F.optional
C,F显示答案
以上解析由 考满分老师提供。
