下列各项中，属于人类语言产生的最主要原因的是 [ ]
A．使用和制造工具
B．大脑越来越发达
C．群居生活
D．火的使用
C
If a firm uses the weighted average cost of capital (WACC) to discount cash flows of higher than average risk projects, which one of the following will most likely occur（）
A. Project NPVs will be understated.
B. The overall risk of the firm’ s investments will rise over time.
C. The WACC of the firm should fall over time.
避暑山庄外八庙规模最大的是哪一座寺庙？
