结构化开发生命周期法是采用______方法形成整个系统信息模型的。
A．自顶向下 B．自底向上 C．自顶到底 D．自上到下
参考答案：A
景泰蓝的表层用金丝，彩釉装饰，用（）做胎？
Mary felt sad over the loss of photos she had shot in Australia, _____ that was a memory she especially
treasured. [ ]
A. as
B. which
C. when
D. where
