A:楚庄王想了解青铜鼎的铸造
B:楚庄王想借助周王室争霸
C:分封制受到挑战
D:楚庄王已与周王平起平坐
为了保护环境,生活中你不会采取下列哪种方式( )
—I ______ twenty yuan on it. It was 50% off.