句型转换。

1. It's about five kilometers from my home to the school. (对划线部分提问)

    _____ is it from my home to the school?

2. My sister does her homework in the evening.(改为一般疑问句)

    _____ your sister _____ her homework in the evening?

3. I think Mr. Chen is in London. (改为否定句)

    I _____ Mr. Chen _____ in London.

4. The two boys want to travel. (改为同义句)

    The two boys want to _____.

5. He works in a factory. (对划线部分提问)

    _____ he _____?

某工程双代号时标网络计划如下图所示，其中工作B的总时差和自由时差（）

A．均为1周

B．分别为3周和1周

C．均为3周

D．分别为4周和3周