Read and order 给打乱顺序的句子重新排序。
① Ok, I'll take it.
②How much is it?
③Can I help you?
④What size?
⑤It's ninety yuan.
⑥Size six.
⑦Yes, please. I want a pair of shoes.
____
一次数学测验,100名学生中有25名得了优秀,则优秀人数的频率是____
中国宇航员____乘神舟五号飞船航天飞行圆满成功,圆了中华民族的“飞天梦”。
工业革命首先开始的国家与部门是( )