题目内容
将下面的句子排出正确的顺序
A．Unluckily, it blew up, killing a passing police officer.
B．The first traffic light, a pair of red and green gas lamps was installed(装备)outside.
C．It was to keep the large number of carriages in the area from colliding.
D．Soon, the first automatic traffic light was installed in Wolverhampton, England in 1926.
E．It remained in service until 1968.
F．That couraged further experiments in traffic control for a long time.
答案：
解析：
解析：
|
B |
C
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