某墙体设计配筋为φ14@200，现无φ14钢筋，拟用φ12按等面积原则代换，试计算代换后每米几根。
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There are_________ of visitors to Kunming.
A. tens of thousands 2000
B. about ten of thousands
C. about three thousands
D. about three thousand
My brother lived at home before he got married, and so ___.
A. did I
B. had I
C. I had
D. I did
广告歌曲通常有（)型、（)型、家庭歌曲型和（)型等几种。
He went to the market and bought __eggs and some meat.
A. three dozen of
B. three dozen
C. three dozens
D. three dozens of
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