网址:http://m.1010jiajiao.com/timu_id_2294702[举报]
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Henry and his friends are going hiking tomorrow.They’ll start early in the morning.Everything was ready and he went to bed.Suddenly he remembered he had to take a pair of socks with him.But something is wrong with the light in his bedroom and he can’t mend it.There are ten socks in a box, five of them are white and the others are black.He has to take some of them to identity(辨认)them.
How many socks does he have to take out at least so that there’s a pair of the same socks among(在……当中)them?
Two.
Three.
Four.
Five.
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