与呈复性请示相比，呈转性请示的结构特点是：表意中心和表述中心都集中在（）部分。
参考答案：主文
Jane is supposed to stop working. She has a serious headache because she ______ all the morning .
A．wrote
B．is writing
C．had written
D．has been writing
What can be inferred about old nepotism
A．Parents maximized the family advantages for the benefits of their children.
B．Parents gave full respect to the likes and dislikes of their children.
C．Children had their own choice of career and marriage.
D．Children willingly lived on the expectations of their families.
