我是小法官。
Mike and John: Happy birthday to you, Sarah!
Sarah: Thank you.
Mike and John: How old are you?
Sarah: I'm ten.
Mike and John: These are for you. A cake and two kites!
Sarah: Thank you. Let's eat the cake.
Mike and John: Great!
阅读对话,判断对错。
(-2)2的算术平方根是( )
一般用____做炒锅,因为便宜、坚硬、而且____;
____ P+____O2 点燃_ ____P2O5
____ Fe2O3+____C 高温_ ____Fe+____CO2
____ Fe2O3+____CO 高温_ ____Fe+____CO2.