设命题p:函数$f\left(x\right)=lg(a{x}^2-x+\frac{1}{4}a)$的定义域为R;命题q:不等式3^x-9^x<a对一切正实数均成立.如果命题“p或q”为真命题,且“p且q”为假命题,则实数a的取值范围是 (   )

       A                                                      B

How are you?____                    A. Yes, it is.

What is this in English?____      B. They are in the pencil case.

What color is it?____                C. She is my sister.

Is Tom your brother?____         D. No, they aren't.

where are the pens?____          E. It's red.

Are those his parents?____       F. Green.

What's her family name?____     G. It's a dictionary.

Happy birthday to you!____      H. Yes, he is.

Is this his ruler?____                  I. I'm fine, thanks.

Who is she?____                      J. Thank you.