He didn't get the best result in the examination, though he worked _______ in his class.[ ]

A. hard

B. harder

C. hardest

D. hardly

在商场柜台上，一台彩电的标价是3000元。这3000元是______。
①货币在执行价值尺度职能②货币在执行流通手段职能③现实的货币④观念中的货币⑤商品的价值⑥商品的价格

A．①③⑤
B．②④⑥
C．①④⑥
D．②③⑤