1. a)Was Nature the source of people since ancient times? -Общий вопрос
b)When was Nature the source of people?- Спец.вопрос.
c)Was Nature the source of people since ancient times or in our times?- Альтернативный вопрос.
d)Since ancient times Nature was the source of people,wasn't it?- Разделительный вопрос.
2.а)Did people live in harmony with environment?
b)What did people live in harmony with?
c)Did people live in harmony with environment or they pollute it?
d)People lived in harmony with environment,didn't they?