根据康德的推论逻辑，“两点之间直线最短”是（）命题
参考答案：综合
_____ the 2000 Olympic Games will be held in Beijing is not known yet. [ ]
A. If
B. Whether
C. That
D. When
冠心病主要的易患因素有()
A．高血压
B．高脂血症
C．吸烟
D．肾功能损害
E．糖尿病
