题目内容：
Accordingtothispassage,
A．brokersusuallyperformthesamekindsofservicestotheircustomers． B．brokershavelittlecontactwitheachother．
C．opencompetitiontendstoresultinacommonpriceforsimilartransactionsatanygivenmoment．
D．changesinthepressureofavailablesuppliesoffundsuponmarkettendstomaintainacommonpriceforsimilartransactions．
参考答案：【答案仅供学习，请勿对照自行用药等】
答案解析：