隧道施工前，应按照（）的测量资料，进行核对和交接。
参考答案：设计单位交付
The result was not the same as they had expected, _____ was rather disappointing. [ ]
A. that
B. which
C. when
D. what
植物的叶片为什么是绿色的秋天时，叶片为什么又会变黄色
