题目

四边形有条直的边，有个角。 黑板面的形状是边形，的形状也是四边形。 答案：【1】4【2】4【3】四【4】窗户To greatly raise people’s living conditions, _______.   A. all kinds of measures have taken B. they have taken all kinds of measures C. it is said that they have taken all kinds of measures D. I think they have taken all kinds of measures