历史上最早用数学方法计算十二平均律的数学家是（）。
A.亚里士多德
B.张衡
C.朱载堉
D.毕得哥拉斯
参考答案：C
网络评估和优化是以提升网络（）为目标的。
Lucy's new job paid twice as much as she had made ________in the restaurant.
A．working
B．work
C．to work
D．worked
