单项选择题

有4个顶点，如何连接4个顶点所用的管道最短？( )。 A. B. C. D.

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单项选择题

What happened to Rip at the end of the story?( )
A、He returned to his home to live out the rest of his life as before.
B、He moved in with his daughter and her husband.
C、He built a cabin for himself and his dog high up in the mountains
D、He moved into the hotel and became a partner in the business.

答案：正确