数理逻辑和分析哲学的奠基人是（）
A、哥德尔
B、弗雷格
C、希尔伯特
D、冯·诺依曼
参考答案：B
剖面主要用于表达机件的（）形状。
The old man was telling a funny story, surrounded by many kids, _________ with fascination.
A．all of whom listened
B．all of whom listening
C．all of them listened
D．all of them were listening
