《文心雕龙》是我国第一部文艺理论专著，其作者是______。
A．曹丕
B．曹植
C．刘义庆
D．刘勰
参考答案：D
—Hello! May I speak to Alice?
—Sorry, she _____ Shanghai. [ ]
A. have gone to
B. has been to
C. has been in
D. has gone to
假设一条大截面电缆与两根小截面电缆并联运行，同样能满足用户需要，忽略经济因素，您选用娜种方式？为什么？
