表示时间：
(1) 表示时间的某一点、某一时刻或年龄等用 at
I get up at six in the morning.我早上六点钟起床
词组 at crazy /go on/take on /.还有别的吗？嗯....at home ,at the moment ,at last,at least.......on the way ,on the road, on time,on my own......