题目

Stonehenge is probably the most important prehistoric monument in Britain. The Stonehenge we see today is the final stage that was completed about 3,500 years ago. The first Stonehenge was a large earthwork, consisting of a ditch（沟）, bank and the Aubrey holes, all probably built around 3,100BC. The holes themselves were not for the purpose of graves, but as a part of religious ceremony. The second stage of Stonehenge started around 2,150BC. About 82 bluestones, some weighing 4 tons each, is thought to have been carried by water along the south coast of Wales and up the rivers Av看电影时，人们在电影院各个座位上都能看到屏幕上的画面，其原因是 [　　] A．银幕向各个方向发出了光 B．光在银幕上发生了镜面反射 C．光在银幕上发生了漫反射 D．银幕对光既发生漫反射，又发生镜面反射