—Is your school bigger than ours?

—Yes. I guess it is________your school.

A．as twice the size of

B．as two thirds big as

C．bigger than half

D．one third bigger than

表示“a与b的两数和的平方”的代数式是 [      ]

A．a²+b²

B．a+b²

C．a²+b

D．（a+b）²