2. 外语
  3. Black holes are part of space. The center of a black hole is empty.

Black holes are part of space. The center of a black hole is empty.

admin2009-01-21  60
问题 Black holes are part of space.  
The center of a black hole is empty.
选项 A、Right
B、Wrong
C、Not mentioned
答案B
解析
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