用所给词的适当形式填空 ______(be) they chicks?No,they're___用所给词的适当形式填空______(be) they chicks?No,they're_____(bird )

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用所给词的适当形式填空 ______(be) they chicks?No,they're___
用所给词的适当形式填空
______(be) they chicks?No,they're_____(bird )

Are. birds