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题目内容
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.
- Aacademic
- Btechnical
- Cdemanding
- Dtheoretical
- Eonerous
- Finconvenient
A,D显示答案
以上解析由 考满分老师提供。