秦王嬴政认为自己“德高三皇，功过五帝”，这主要是指他
A．继承了秦国王位
B．在全国推行郡县制
C．灭六国统一天下
D．修建万里长城
答案：C
_____ our national football team lost the game to a weak team as Syria by 2 to 3, I held no doubt about
the new coach's ability.[ ]
A. Until
B. By the time
C. Unless
D. After
要使光滑的圆球被光滑的挡板挡在光滑的斜面上不滚落下来，如图所示的几种方法中，板上所受压力最小的是( )
