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．

Two and three is ________.

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There are two fathers and two sons．How many people at least are there?

1. A.
   Four．
2. B.
   Three．
3. C.
   Two．
4. D.
   Five．

What's one and three? ________.

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