题目内容：
Accordingtothispassage,
A．brokersusuallyperformthesamekindsofservicestotheircustomers． B．brokershavelittlecontactwitheachother．
C．opencompetitiontendstoresultinacommonpriceforsimilartransactionsatanygivenmoment．
D．changesinthepressureofavailablesuppliesoffundsuponmarkettendstomaintainacommonpriceforsimilartransactions．
参考答案：
答案解析：