【刷子】工具有（）种刷子形状可以选择。
A.6
B.7
C.8
D.9
参考答案：D
任何道路等线状地物都可作为单元划分的界线。()
The host family went out of ______ way to make us feel at home. [ ]
A. they
B. them
C. their
D. those
