What's one and three? ________.

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Two and three is ________.

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Tony has(有)two black cats,three white ones and two black and white ones．How many cats has she in all(总共)？

1. A.
   Six．
2. B.
   Four．
3. C.
   Seven．
4. D.
   Nine．

Four and two and three is ________．

[　　]

Tony has(有)two black cats,three white ones and two black and white ones．How many cats has she in all(总共)？

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