— I'd like to travel to Moscow for vacation.
— Be realistic! For our poor situation at present, we can't _____ a vacation.
A:afford
B:offer
C:accept
D:provide
下图表示两类不同经济发展水平国家的人口年龄构成,读图回答有关问题:
如图所示,把小车放在水平桌面上,向挂在小车两边的托盘里加相同的砝码,下列说法正确的 ( )