Нужно задать все вопросы к предложению many rivers and lakes are poisons too.

Many rivers and lakes are poisoned too.

Are many rivers and lakes poisoned too?
Many rivers and lakes are poisoned too, aren't they?
Are many rivers and lakes or soils poisoned too?
What is poisoned too?
Why are  many rivers and lakes poisoned too?
Whom are many rivers and lakes poisoned by?