教师教学和学生获得知识的基本材料是( )。
A.课程标准
B.课程计划
C.教科书
D.教学指导书
参考答案:C
解析:师生直接接触到的教科书是教师教学和学生获得知识的基本材料。
将十进制257转换为十六进制数为( )。
A.11
B.101
C.Fl
D.FF
— What was wrong with John yesterday?
— He was too shy to talk to ______ at the party. [ ]
A. anyone
B. someone
C. no one
D. everyone