句型转换。

1. She is going to do some reading. (对画线部分提问)

   ________________________________________________________

2. I would like to see the Terra Cotta Warriors. (改为同义句)

   I______________ ______________see the Terra Cotta Warriors.

3. Are you going for a field trip? (同上)

   Are you ______________to______________a field trip?

4. I think you're going to have a fun field trip. (同上)

   I think you're going to _______________much______________ on a field trip.

5. It's near Xi'an. (同上)

   It's_______________ Xi'an.

已知先张法部分预应力混凝土简支空心板梁的跨中截面尺寸如题图所示。计算跨径L_o=12.60m。空心板采用40号混凝土，弹性模量E_h=3.3×10⁴N/mm²，预应力钢筋选用，其截面面积A_v=1256mm²。已求得预应力钢筋重心处的压应力为零时，预应力钢筋的预应力值σ_yo=565.86N/mm²。等效工字形截面几何特性：换算截面面积Ao=319 144mm²，换算截面对形心轴的静矩S_o=31 725 531mm³，换算截面对受拉边缘的截面抵抗矩Wo=5.104×10⁷mm³，换算截面对形心轴的惯性矩I_o=1.475×10¹⁰mm⁴，截面开裂后的换算截面惯性矩I₁₀=3.642×10⁹mm⁴，预应力的合力至形心轴的距离e_oy=249mm。

预应力钢筋中的预加力为（）。

A．710.7kN

B．710.2kN

C．698.21kN

D．745.23kN