【题目】The traffic on the main streets has a longer green signal than that on the small ones. What does the underlined "that" refer to?
A.the trafficB.the signalC.the streetD.the time
在线课程【答案】A
【解析】
考查名词辨析。句意: 主要街道上的交通信号灯的绿灯时间要长于其他小街道上的信号灯绿灯。画线句that只得是？此处that此处指代上文的the traffic，以避免重复，表示同类但不同一的事物。故选A。