A:am reading
B:have read
C:will read
D:read
公元前206年,汉高祖刘邦定都咸阳,建立西汉。( )
Bob has got good exam results. His parents are proud of his ______.
身高1.8米的人在阳光下的影长是1.2米,同一时刻一根旗杆的影长是6米,则它的高度是( )