判断题

平面截切棱锥，截交线是截平面和棱锥共有线。

答案：正确

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单项选择题

Prof. Hoffmann told Dr. Pan that Carl Sagan, who wasa professor of astronomy at Cornell University, would be the most important scientist in modern America, not because he was _____________, but because he taught Americans to be interested in space.

A．the best astrophysicist
B．the best quantum physicists
C．the best nuclear physicist
D．the best theoretical physicist