“开而弗达”体现了教学的( )
A．直观性原则B．巩固性原则C．启发性原则D．循序渐进的原则
参考答案：C
若sin（θ+24°）=cos（24°-θ），则tan（θ+60°）=______．
You can imagine what great tuouble we had_____ the school for the blind.[ ]
A. setting up
B. to set up
C. set up
D. to setting up
