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Is that your backpack?          .

A．No, it isn’t.                        B．Yes, it is. It’s my backpack.

C．It’s her backpack.           D．No, it isn’t. It’s her backpack

Is this your key?            - __­­­­___­­­­_

 —Meat isn’t really dangerous, is it?

—Oh! _________! It’s not at all good for our health.

A．Yes, it isn’t         B．No, it is                   C．Yes, it is      D．No; it isn’t