西汉时期，日本列岛上的国家有[ ]
A．30多个
B．50多个
C．80多个
D．100多个
答案：D
He spoke at the meeting and said that three years in high school ________ not long. [ ]
A. be
B. are
C. is
D. been
以下哪项不是[摘要（Summary Info）]中显示的内容（）.
A.[面数（Faces）信息
B.对象的[运动模糊（Motion Blur）信息
C.对象的[材质类型（Material TypE.信息
D.对象的ID信息
that three years in high school ________ not long. [ ]