（﹣2xy³z²）³=(    )

x^m+n_·x ^m﹣n=x¹⁰，则m=(    )．

Thank you for the wonderful meal, Mrs. Hanson.（）

A.Oh, I don't think you ate well.  

B.I'm not a good cook in fact. 

C.Be careful next time

D.I'm glad you enjoyed it.