居室内的自然照度至少需要多少才能基本满足视觉功能的生理需要（）。
A.15lx
B.25lx
C.30lx
D.75lx
E.100lx
参考答案：D
对井下机车运输信号有什么要求？
It is said that Mo Yan's hometown is the place ____ has inspired him throughout his writing career．
A．in which
B．where
C．that
D．what
