20 12 why is the second choice of the seventh multiple-choice question in the mathematics examination paper of Tianjin senior high school entrance examination wrong?

Seen from the front, the number of two columns of squares from left to right is 21; Seen from the left, the number of two columns of squares from left to right is 21; As can be seen from the above, the number of squares in the upper and lower rows is 2 1, so we choose B.

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