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问题: is or are

1.what color _____their hair?
a. is b.are
2."不可数名词前如果有复数名词短语修饰,则谓语动词用单数"我在一本书上看到这句话,什么意思?对吗?举例说明?

解答:

选 A. is.

因为 what color 是单数, their hair也是单数.

但是你的句子太中文了,英文的说法该是:
what is the color of their hair?
what are their hair colors?

补充,忘了回答第二个问题了: 即使有复数名词词组修饰不可数名词(或者可数的单数),那么最后的名词还是单数,当然动词要用单数. A three story building is not very high.
Three cup water is not much.