看图片，选择正确的单词补全对话，只写序号。
A. mother B. big C. thin D. little
A: Look at the father panda. It's 1.
________ .
B: And this is the 2.
________ panda. It's very fat.
A: Look! The baby panda is 3.
________ .
B: Yes, it is. And Look at the sister panda. It's very 4.
________ .
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