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题目内容双击单词支持查询和收藏哦～
A decisive way to test planet formation hypotheses is to study planetesimals, but these objects are quite ___________, neither numerous nor large enough to emit significant radiation that can be captured by telescopes.
- A.unpredictable
- B.inconspicuous
- C.clustered
- D.radioactive
- E.discreet
- F.erratic
B,E显示答案
以上解析由 考满分老师提供。
