一个三角形的底和高都为原来的3倍，它的面积为原来的[ ]
A．3倍
B．6倍
C．9倍
D．18倍
答案：C
Low-carbon lifestyle is of great benefit to improve the world environment．____ can be
enjoyed from it until you have a deep under, standing of it，however．
A．Something
B．Nothing
C．Few
D．Much
某网络计划在执行中发现B工作还需作业5天，但该工作至计划最迟完成时间尚有4天，则该工作( )。
A．正常B．影响总工期1天C．影响总工期4天D．影响总工期5天
