What are these?They have 3 eyes,red,yellow and green.Oh,they aretraffic light.But why do they have 3 colours?Because there ary_______ ________.
这是完整的题目,不知道横线上填什么啊,
人气：468 ℃ 时间：2020-04-18 09:09:40
解答
What are these?They have 3 eyes,red,yellow and green.Oh,they aretraffic light.
But why do they have 3 colours?Because there are _three______ __signals______.
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