比一比，再组词。

瑞(      )端(      )  泛(      )眨(      )

士(      )土(      )  饲(      )词(      )

犁(      )梨(      )  腹(      )复(      )

秆(      )杆(      )  殊(      )株(      )

Jack does his homework ________ Mary. So they both always get good grades in the exams.

A．so careful as

B．as carefully as

C．so carefully as

D．as careful as