题目内容：
The center of a black hole is empty.
A．Right B．Wrong
C．Not mentioned
参考答案：
答案解析：
单选题：The center of a black hole is empty.
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B．Wrong
C．Not mentioned
B．Wrong
C．Not mentioned
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He began his talk by giving a concise definition of post-modernism.A．long and d
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She has proved that she can be relied on in a crisis.A．lived on B．depended on C．
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