题干
Beijing, the capital of China, is one of ______ cities in the world．
A：big
B：bigger
C：much bigger
D：the biggest
答案(点此获取答案解析）
D
A：big
B：bigger
C：much bigger
D：the biggest
，这条光线从BC边射出棱镜后的光线与界面BC的夹角为（ ）
