按要求改写句子。

1. Please write down your name here. (改为否定句) 

    Please ____ write down your name here.

2. I swept the floor just now. (改为一般疑问句)

    ____  you ____  the floor just now?

3. She needs to wear her school uniform. (改为否定句)

    She ____  ____ to wear her school uniform.

4. I often help my mum do the laundry on Sundays. (改为同义句)

    I often help my mum ____ ____ on Sundays.

5. The boy is cleaning the table. (对画线部分提问)

    ____ ____ the boy ____ ?

地基中心点下附加应力的计算（见图3.1.4.2）。基础底面埋深D=1.5m，基础尺寸BL=1.25m×2m，相应于荷载效应标准组合时，上部结构传到地面处的荷载为200kN，基底上下均为黏土，土的重度γ=18.1kN/m3，饱和重度为19.7kN/m3，地下水位位于基底下1．0m处，则基底中心点下3．0处的附加应力为（）kPa。（）

A.2.40

B.7.29

C.9.61

D.29.16