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题目内容双击单词支持查询和收藏哦～
Although collisions between the largest planetesimal belt are _________, they can release large amounts of debris when they occur.
- A.risky
- B.exceptional
- C.irregular
- D.violent
- E.rare
- F.powerful
B,E显示答案
以上解析由 考满分老师提供。
