阿摩線上測驗
37. Which of the following statements is true, according to the passage?
(A) Knight was injured in the explosion of his traffic light.
(B) Potts' traffic light was the first one to appear in the USA.
(C) The first traffic signal originated from the idea of a traffic director.
(D) Future vehicles may not need traffic lights to cross an intersection.
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統計： A(20), B(27), C(41), D(109), E(0) #3381964
統計： A(20), B(27), C(41), D(109), E(0) #3381964
