英语:读一读,想一想,猜一猜What is black when it is clean and white when it is dirty?It is a ( ).

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英语:读一读,想一想,猜一猜Whatisblackwhenitiscleanandwhitewhenitisdirty?Itisa().英语:读一读,想一想,猜一猜Whatisblackwheniti

英语:读一读,想一想,猜一猜What is black when it is clean and white when it is dirty?It is a ( ).
英语:读一读,想一想,猜一猜
What is black when it is clean and white when it is dirty?It is a ( ).

英语:读一读,想一想,猜一猜What is black when it is clean and white when it is dirty?It is a ( ).
黑板,blackboard