2. 外语
  3. Black holes are part of space. Black holes exist but are difficult to observe.

Black holes are part of space. Black holes exist but are difficult to observe.

admin2009-01-21  81
问题 Black holes are part of space.  
Black holes exist but are difficult to observe.
选项 A、Right
B、Wrong
C、Not mentioned
答案A
解析
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