I want to return the book to Jack, but I can’t find him.

He       the library . you can find him there.

A  has been to  B  has gone to  C  has left  D  went to

下列脊柱表现，哪种属"正常变异"（）。

A.儿童椎体变扁

B.幼儿齿状突呈分裂状

C.儿童指骨骨骺呈毛刷状

D.儿童颈椎椎体双凹变形

E.儿童颅底扁平