2. 外语
  3. Scientists have______for years that turbulence within the gaseous clouds found throughout the Milky Way stymies star formation,

Scientists have______for years that turbulence within the gaseous clouds found throughout the Milky Way stymies star formation,

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问题 Scientists have______for years that turbulence within the gaseous clouds found throughout the Milky Way stymies star formation, but some of the forces behind this disturbance remain______.
选项 A、doubted … insufferable
B、posited… unknown
C、argued… relative
D、assumed… exoteric
E、conveyed … insuperable
答案B
解析
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