What are those?___They are books.(改为单数句)—————?————————。

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What are those?___They are books.(改为单数句)
—————?————————。

what is this?---This is a book.

What's this?It's a book.

what is this?-It is a book.

What is that?It is a book.

What is that? It's a book!

what is this ? It is a book.

what is this? it is a book