以下器官属于消化系统，但不能分泌消化液的是[ ]
A．胰腺
B．肝脏
C．胃
D．咽
答案：D
—_____ you write so well?
—By reading and keeping diaries every day.[ ]
A. How is it that
B. Is it how that
C. How it is that
D. What is it that
以下哪个选项符合铺底的灰浆厚度要求（）。
A.40mm
B.60mm
C.90mm
D.100mm
