how much are the blue trousers?I would like to buy that pair of jeans?how much is it?

how much are the blue trousers?I would like to buy that pair of jeans?how much is it?

题目
how much are the blue trousers?I would like to buy that pair of jeans?how much is it?
为什么上面用are,下面用is?
答案
上句主语是 the blue trousers ,复数
第二句主语是 that pair of jeans ,看做整体,在于pair ,所以用 is.
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