单选题：The weather is a constant subject of conversation in Britain

题目内容：

The weather is a constant subject of conversation in Britain. A．question
B．problem
C．title
D．topic

参考答案：

答案解析：

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根据材料，回答问题。 Family HistoryIn an age when technology is developing faster than eve

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两根同样长的蜡烛，点完粗蜡烛要3小时，点完细蜡烛要1小时。同时点燃两根蜡烛，一段时间后。同时熄灭，发现粗蜡烛的长度是细蜡烛的3倍。问两根蜡烛燃烧了多长时间?A

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