句型转换

1.My parents were repairing the computer at this time yesterday.(对画线部分提问)

_______ _______ your parents doing at this time yesterday?

2.The wall around this city is 13.7 kilometers long.(对画线部分提问)

_______ _______ is the wall around the city?

3.It took them about five hours to finish the work.(改为一般疑问句)

_______ it _______ them about five hours to finish the work?

4.I think this story is the funniest of all the stories.(同义句转换)

I think this story is _______ _______ any other story.

5.Grandma Zhou enjoys the life in the countryside because it is much cleaner there. (对画线部分提问)

_______ _______ Grandma Zhou enjoy the life in the countryside?

流行病学研究方法不包括（）

A.描述性研究

B.分析性研究

C.实验性研究

D.理论性研究

E.探索性研究