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题目内容双击单词支持查询和收藏哦～
Although the Kuiper Belt—the icy region of the solar system where Pluto orbits—was once much more crowded, today it has such a low density of objects that collisions between them are __________.
- A.inconsequential
- B.ongoing
- C.unthinkable
- D.improbable
- E.continuous
- F.unlikely
D,F显示答案
以上解析由 考满分老师提供。
