To everyone's surprise, Alex play chess very well when he was only four.
A:might
B:should
C:would
D:could
下图臂章佩用时间转为公元纪年,应是( )
甲、乙两车同时同地反方向做匀速直线运动,它们的s﹣t图象如图所示.12秒钟时甲乙两车相距____ 米,以甲车为参照物,乙车是____ (选填“运动”或“静止”)的,甲车____ (选填“一定”或“可能”)受的是平衡力.
天气预报中说今天有寒潮到来,你将做的准备应该是( )