单项选择题


Passage Three
Questions 32 to 35 are based on the passage you have just heard.

A．It has an intense gravity.
B．It can change space and time in basic ways.
C．Nothing can escape from it.
D．It has been predicted by theory but never confirmed.
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All the 9,500 women who participated in the research would have little exercises or would only walk just a mile a day before the research.
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