任何钢经淬火后，其性能总是变得硬而脆。( )
参考答案：错
根尖孔的位置比较多见于（）
A.根尖
B.根尖舌侧
C.根尖近中侧
D.根尖远中侧
E.根尖唇、颊侧
5. He said he had stolen the money but he couldn’t ______ the fact that the money was found in his house.
A．answer for
B．leave for
C．account for
D．care for
