Never before in China __________ so carefully concerned about the food safety.

A．people have been

B．have people been

C．are people

D．people are

社会主义企业的成本利润率可以（）

A.反映所耗费活劳动的效益

B.反映企业资金总量中被消耗的那部分资金的效益

C.反映企业所占用的全部资金的效益

D.反映企业生产的全部产值的效益