图书馆建筑书库0.25m垂直面照度标准值为（）。
A.5001x
B.3001x
C.1501x
D.501x
参考答案：D
I put the fish in the ice box to keep it .
A．fresh
B．full
C．new
D．young
He is writing ____ chalk. [ ]
A. white
B. in
C. with
