题目

We can't do it best if we don't(完全地)put our hearts into the thing we are doing. 答案：【1】entirely1．小明同学把一个含有45°角的三角板放在如图所示两条平行线m、n上，测得∠β=70°，则∠α的度数是（　　）A．105°B．110°C．115°D．125°