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The cat is black but it has white ( ),and the cat usually us

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The cat is black but it has white ( ),and the cat usually uses them to catch mice.
Why can a plane fly in the sky?
Maybe because it has ( ) ,like a bird..
The fish can swim around in the water with the help of its tail and ( ).
How do you know the chicken is new-born?
Look at its ( )they are still wet.
The cat is black but it has white ( ),and the cat usually us
第一个claw(爪子)
第二个wings(翅膀)
第三个skin
第四个feather(羽毛)