⑴Can I help you? ____      A. Of course.

⑵Are they OK?____         B. Yes.

⑶Can I try them on?____    C. Thank you.

⑷Here you are!____         D. No. They're too small.

下列赋值语句中正确的是（　　）

教室里不同位置上的同学都能看到黑板上的粉笔字是 ____，黑板反光是 ____（填“漫反射”或“镜面反射”）。漫反射 ____（填“遵循”或“不遵循）光的反射定律。