【单选题】His father began to work ______his childhood.
【单选题】明长城中保存最完好、最具代表性的一段是()。
【判断题】艺术的价值更多地体现在“艺术附加值”上。
【单选题】8名患者的体重(kg) 分别为: 51、45、46、52、58、51、57、70,其中位数为( )
【单选题】Tom went to open the door. ______, his father began to wash dishes. [ ]
【简答题】各种表面加工方法所能达到的精度和()都有一个相当大的范围。
【单选题】His father began to work ______ his childhood.