Finding her car stolen, _______.

A．a policeman was asked to help

B．the area was searching thoroughly

C．it was looked for everywhere

D．she hurried to a policeman for help

在证券交易所的交易市场中，交易地点和进场参加交易的人员都是（）。

A．大量的

B．偶尔的

C．多变的

D．固定的