The accident happened ______ a cold winter morning.[ ]
A. in
B. on
C. at
D. of
答案:B
A、B、C、D在一条直线上如此排列:B距A,8厘米;C距A,15厘米;,D距B与D距C的距离和是10厘米,求D距A______厘米.
"芭蕾舞"为了表演的需要,芭蕾鞋的鞋尖内塞有一小块什么物品?