山东快书最初没有正式的名称，因早期主要以“（）”为说唱内容，人们称之为“说武老二的”或“唱武老二的”。
参考答案：武松故事
一种游标卡尺，它的游标尺上有50个小的等分刻度，总长度为49mm。用它测量某物体长度，卡尺示数如图所示，则该物体的长度是______________cm。
Lai Changxing _____ Canada with his family before the policemen began to catch him. [ ]
A. had been to
B. has gone to
C. would go to
D. had arrived in
