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题目内容双击单词支持查询和收藏哦～
The first images of Jupiter's moon Callisto show bright regions of material, as if older and darker ice had slid downhill and exposed the _____ ice underneath.
- A.ancient
- B.murky
- C.compact
- D.pristine
- E.grimy
- F.unblemished
D,F显示答案
以上解析由 考满分老师提供。
