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题目内容双击单词支持查询和收藏哦～
The problem of not understanding the solar wind, a high-speed stream of particles permeating space around Earth, is not merely ____________: explosive solar energy traveling through it threatens astronauts and satellites orbiting Earth.
- A.academic
- B.technical
- C.demanding
- D.theoretical
- E.onerous
- F.inconvenient
A,D显示答案
以上解析由 考满分老师提供。
