艺术界闻名遐尔的[清明上河图]出自何人之手？
参考答案：
出自于张择端之手。
当朗伯-比尔定律用A=εbc表示时，b的单位用cm、c的单位用mol·L-1表示，ε称为______。
Even though I have been to her apartment several times before, I still don't remember ______ .
A．which building it is in
B．which the building is in
C．which is it in
D．which building is it in
