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题目内容
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 _____.
- Ainconsequential
- Bongoing
- Cunthinkable
- Dimprobable
- Econtinuous
- Funlikely
D,F显示答案
以上解析由 考满分老师提供。